Sentence Addition and Deletion Decisions

[1] For decades, art historians believed that the vibrant blue pigment in Johannes Vermeer’s paintings was derived exclusively from ultramarine, a costly paint made from crushed lapis lazuli. [2] Vermeer's lavish use of this expensive material contributed significantly to the chronic debt that plagued his family. [3] However, recent chemical analysis of several canvases, including Girl with a Pearl Earring, reveals a more calculating reality: Vermeer frequently blended ultramarine with smalt, a cheaper pigment made from ground cobalt glass. [4] This blending technique allowed him to achieve his signature luminous glazes without depleting his scarce resources. [5] By layering the cheaper smalt underneath a thin topcoat of pure ultramarine, Vermeer created the optical illusion of deep, costly blue while conserving his precious supply of lapis lazuli.

The writer is considering adding the following sentence to the paragraph:

"Lapis lazuli was imported to Europe primarily from mines in northeastern Afghanistan, making the mineral more valuable than gold at the time."

Should the writer make this addition?

Although the impact of the 1883 Krakatoa eruption on global temperatures is well-documented, its influence on nineteenth-century British art remains a subject of debate. Some art historians argue that the vibrant, crimson sunsets in William Ashcroft’s pastel drawings from the mid-1880s were direct records of the volcanic aerosols that dispersed worldwide.

[1] Ashcroft, who resided in Chelsea, London, created thousands of these quick sketches from his west-facing window, starting just months after the cataclysm.

Others, however, contend that his palette was merely a continuation of a pre-existing British aesthetic tradition of dramatic twilight scenes, suggesting the volcanic dust was coincidental to his style.

The writer is considering deleting Sentence 1 (marked by [1]) from the passage. Should the sentence be kept or deleted?

Passage

For over a century, the giant tortoises of the Galápagos Islands have fascinated biologists studying evolutionary adaptation. These massive reptiles, which can weigh up to 500 pounds, have developed distinct shell shapes depending on the environment of their specific island. On wetter islands with abundant low-growing plants, tortoises have dome-shaped shells that keep their necks closer to the ground. On drier islands where food grows higher up, they have 'saddleback' shells with a high arch that allows them to stretch their necks upward to reach tree cacti. *Charles Darwin visited the Galápagos Islands in 1835.* This physical variation directly illustrates how species adapt to their local habitats over generations.

Question

The writer is considering deleting the italicized sentence from the passage. Should the writer make this deletion?

A student is writing an essay about the invention of the Post-it Note.

[1] In 1968, Spencer Silver, a chemist at 3M, was attempting to develop a super-strong adhesive for the aerospace industry. [2] Instead, he accidentally created a 'low-tack' adhesive that could be easily peeled off surfaces without leaving any residue. [3] Years later, his co-worker Art Fry realized this weak adhesive could be used to keep bookmarks from falling out of his hymnal. [4] This simple concept led to the creation of the Post-it Note, which is now a staple in offices worldwide.

The writer is considering adding the following sentence after Sentence 2:

'Super-strong adhesives are also used in construction to bond heavy building materials together.'

Should the writer make this addition?

Many cities are replacing traditional streetlights with light-emitting diode (LED) bulbs to save energy. These modern bulbs consume up to 80 percent less electricity than standard sodium vapor lamps. Although LEDs are highly efficient, some residents complain that the cool, blue-white light they emit is too harsh compared to the warm glow of older lights. Sodium vapor lamps were first developed in the 1930s and became popular for street lighting due to their long lifespan. Consequently, some municipalities are adjusting the color temperature of their new LED installations to address these concerns.

The writer is considering deleting the sentence 'Sodium vapor lamps were first developed in the 1930s and became popular for street lighting due to their long lifespan.' from the passage. Should this sentence be kept or deleted?

In her seminal 1978 essay, literary theorist Sandra Gilbert examined how nineteenth-century women writers navigated a male-dominated literary landscape. [1] Gilbert argued that these authors often employed a "double-voiced discourse," layering subversive themes beneath seemingly conventional plots. This narrative strategy allowed them to appeal to mainstream publishers while simultaneously communicating a critique of patriarchal structures to receptive readers. Charlotte Brontë’s novel *Jane Eyre*, for instance, features a madwoman in the attic who serves as a dark double for the docile protagonist.

The writer is considering adding the following sentence to the passage at [1]:

"Many nineteenth-century publishers were hesitant to print works that openly challenged domestic expectations of women."

Should the writer make this addition?

[1] For centuries, the dry climate of the library of Saint Catherine's Monastery in Egypt preserved layers of hidden writing on parchment pages known as palimpsests. [2] To reuse the expensive animal hides, medieval scribes frequently scraped away older texts, such as translations of ancient Greek medical treatises, before writing new prayers over them. [3] Modern conservationists, however, have begun employing multispectral imaging to photograph these pages under various wavelengths of light, exposing the faint traces of iron-gall ink left behind by the original authors. [4] These manuscripts are kept in highly controlled environments where temperature and humidity are regulated to prevent the parchment from warping. [5] By combining these digital images, researchers have successfully reconstructed lost works, providing scholars with unprecedented access to classical philosophy.

The writer is considering deleting Sentence 4 from the preceding paragraph. Should the sentence be kept or deleted?

High atop a rocky hill in Sion, Switzerland, the Basilique de Valère houses an extraordinary musical relic: an organ constructed in the early fifteenth century. Unlike most medieval instruments, which have been silenced by decay or altered beyond recognition by subsequent restorations, this organ remains playable. Organ builders in the region often utilized local spruce and pine, which grew slowly in the high altitude and possessed dense acoustic properties. This longevity is largely due to a conservative restoration in 1954 that prioritized preserving the original Gothic pipework rather than updating the mechanism to suit modern tastes.

The writer is considering deleting the third sentence from the passage. Should the sentence be kept or deleted?

A student is writing an essay about nineteenth-century astronomy.

[1] In 1845, Irish astronomer William Parsons completed construction on the Leviathan of Parsonstown, a reflecting telescope with a six-foot aperture that was the largest in the world at the time. [2] With this massive instrument, Parsons observed and sketched the spiral structure of the Whirlpool Galaxy, a nebula then known as M51. [3] Prior to this discovery, astronomers debated whether nebulae were merely nearby clouds of gas or distant, independent 'island universes' consisting of stars. [4] The detailed drawings produced by Parsons provided crucial visual evidence that suggested a distinct, organized structure. [5] However, because the Leviathan's metal mirror was highly susceptible to tarnishing in the damp Irish climate, Parsons could only use the telescope on a few clear nights each year. [6] It took several decades of further observation with improved instruments to conclusively resolve the debate in favor of the island universe theory.

The writer is considering deleting Sentence 5 from the paragraph. Should the sentence be kept or deleted?

[1] Sourdough bread relies on a wild yeast starter rather than commercial baker's yeast. [2] This starter, a fermenting mixture of flour and water, captures wild yeasts and beneficial bacteria from the environment. [3] Over time, these microorganisms produce carbon dioxide and lactic acid, giving the bread its characteristic rise and sour flavor. [4] Many commercial bakeries prefer using dry active yeast because it is faster and more predictable. [5] Once the starter is active, it must be regularly fed with fresh flour and water to keep the yeast alive.

The writer is considering deleting Sentence 4 from the paragraph. Should this sentence be kept or deleted?

[1] In the mid-nineteenth century, the construction of the transcontinental railroad transformed the American West, linking the Atlantic and Pacific coasts. [2] The project relied heavily on the labor of thousands of Chinese immigrants, who faced dangerous working conditions and severe discrimination. [3] These workers blasted tunnels through the granite of the Sierra Nevada and laid tracks across the desolate Great Basin. [4] Meanwhile, in the eastern United States, steam locomotives were rapidly replacing canal boats as the primary means of moving freight. [5] Despite their critical contributions, the Chinese workers were excluded from the celebratory photographs taken at Promontory Summit upon the railroad's completion.

The writer is considering deleting Sentence 4 from the paragraph. Should this sentence be kept or deleted?

For centuries, stained glass windows have been used to tell stories and bring vibrant color to places of worship. During the Gothic period, medieval artists created these windows by mixing metallic oxides into molten glass. Copper was added to make red or blue glass, while cobalt yielded a deep, rich blue. [1] Modern stained glass artists often use copper foil to wrap individual pieces of glass before soldering them together. Today, these historical windows are carefully preserved, allowing modern viewers to appreciate their beauty and narrative power.

The writer is considering deleting Sentence 1 from the paragraph. Should the sentence be kept or deleted?

Each spring, maple syrup producers in New England harvest sap from sugar maple trees. To do this, they drill small holes into the tree trunks and insert metal or plastic taps called spiles. Sap, which is mostly water with a low sugar content, drips slowly from these spiles into hanging buckets or plastic tubing. *Sugar maple trees can grow up to eighty feet tall and live for over three hundred years.* This harvested sap is then collected and boiled in large pans inside a sugarhouse. Boiling evaporates the excess water, concentrating the sugars until it becomes the thick, sweet syrup enjoyed on pancakes and waffles.

The writer is considering deleting the italicized sentence from the passage. Should the sentence be kept or deleted?

[1] In 1911, the Italian archaeologist Luigi Pernier discovered the Phaistos Disc in the ruins of a Minoan palace in Crete. [2] The clay disc, covered on both sides with a spiral of stamped symbols, remains one of archaeology’s most famous undeciphered mysteries. [3] Many scholars have tried to decode the 242 signs, which feature representations of human figures, animals, and plants. [4] Some researchers suggest the disc records a sacred hymn, while others argue it is a legal document or a board game. [5] Because the symbols are stamped rather than hand-carved, the disc represents an early precursor to movable type printing, developed thousands of years before Johannes Gutenberg's press.

Given the passage above, the writer is considering adding the following sentence to the end of the paragraph:

"Gutenberg's invention of the printing press in fifteenth-century Germany revolutionized the dissemination of knowledge across Europe."

Should the writer make this addition?

[1] At the ancient Mayan city of Chichen Itza, the pyramid known as El Castillo displays a remarkable acoustic phenomenon. [2] When a visitor claps their hands at the base of the staircase, the echo returning from the temple at the summit sounds uncannily like the chirp of the resplendent quetzal, a bird sacred to the Maya. [3] Some archaeologists argue that this acoustic effect was intentional, engineered by Mayan architects to evoke the voice of their deities during ceremonies. [4] The quetzal was highly valued for its vibrant green tail feathers, which were used to make elaborate headdresses for royalty. [5] Skeptics, however, maintain that the chirp is merely an accidental byproduct of the staircase's stair-step geometry.

The writer is considering deleting Sentence 4 from the preceding paragraph. Should this sentence be kept or deleted?

The writer is considering deleting the following sentence from the passage:

'Monarch butterflies lay their eggs on milkweed plants because they are the only food source for the caterpillars.'

If the passage focuses on the migratory patterns of monarch butterflies, should the writer make this deletion?

[1] For decades, art restorers in Pompeii struggled to clean the delicate frescoes blackened by centuries of soot, volcanic ash, and accumulated wax. [2] Traditional chemical solvents often dissolved the ancient pigments beneath the grime, causing irreversible damage to the vibrant red and yellow depictions of mythological scenes. [3] In recent years, however, conservators have turned to laser cleaning technology, which uses short pulses of light to vaporize the dark encrustations without heating or altering the underlying paint. [4] This precise method allows the frescoes to be restored to their original brilliance, revealing details that had been obscured since the eruption of Mount Vesuvius in 79 CE. [5] Lasers have also become increasingly popular in dermatological clinics for removing unwanted tattoos and scars.

The writer is considering deleting Sentence 5 from the passage. Should this sentence be deleted?

[1] In the early twentieth century, the Chicago school of architecture revolutionized urban design by pioneering the use of steel-frame construction. [2] Before this innovation, buildings relied on thick, load-bearing masonry walls, which severely limited their height. [3] By replacing heavy stone with a lightweight steel grid, architects could build much taller structures while maximizing interior space and window area. [4] Chicago's population grew rapidly during this era, driving demand for dense commercial real estate. [5] Consequently, this engineering breakthrough laid the foundation for the modern skyscraper and transformed city skylines across the globe.

The writer is considering deleting Sentence 4 from the passage. Should the sentence be kept or deleted?

[1] In 1959, Soviet geneticist Dmitry Belyaev began a decades-long experiment to understand how wild animals become domesticated. [2] He hypothesized that selecting animals solely for their tameness would trigger a cascade of physical and behavioral changes over generations. [3] To test this, Belyaev bred silver foxes, selecting only those that showed the least fear and aggression toward humans. [4] Over several generations, the foxes not only became friendly like domestic dogs but also developed floppy ears, spotted coats, and wagging tails. [5] Silver foxes are a color variant of the red fox, *Vulpes vulpes*.

The writer is considering deleting Sentence 5 from the paragraph. Should the sentence be kept or deleted?

[1] Located on the remote Norwegian island of Spitsbergen, the Svalbard Global Seed Vault serves as a secure backup for the world's crop diversity. [2] The facility is built deep inside a sandstone mountain, where permafrost and thick rock ensure that the seed samples remain frozen even without electricity. [3] This isolated location offers excellent protection against political conflicts, natural disasters, and system failures. [4] Interestingly, Spitsbergen is also home to a thriving population of polar bears, which are well-adapted to the harsh Arctic climate. [5] By storing duplicates of seeds from genebanks worldwide, the vault plays a crucial role in safeguarding global food security against future agricultural crises.

The writer is considering deleting Sentence 4 from the passage. Should the writer make this deletion?