Topic Development

[1] In 1995, the reintroduction of gray wolves to Yellowstone National Park initiated a dramatic ecological transformation known as a trophic cascade. [2] Decades of wolf absence had allowed the elk population to explode, leading to severe overgrazing of willow and aspen trees along riverbanks. [3] Once the wolves returned, their predation and presence forced the elk to avoid open valleys, where they were vulnerable. [4] Consequently, the streamside vegetation began to recover rapidly, stabilizing the soil and reducing erosion. [5] This regrowth of trees attracted songbirds and beavers, who used the wood to build dams, creating habitats for fish, amphibians, and waterfowl. [6] The wolves' return ultimately reshaped not just the animal populations, but the physical geography of the park itself.

At this point, the writer is considering adding the following sentence:
'Beavers are known for their ability to significantly alter river ecosystems by building complex lodges and dams.'

Should the writer make this addition after Sentence 4?

The following sentences are from a draft of an essay about the discovery of the cosmic microwave background radiation. To ensure the paragraph logically builds its claim that scientific discovery relies on systematically ruling out alternative explanations before accepting a cosmological conclusion, what is the most logical order of the sentences?

The following sentences are from a draft of an essay about Maya engineering. To ensure that the paragraph logically builds its claim that Maya engineering successfully addressed water scarcity, in what order should these sentences be placed?

Though modern surveyors once dismissed the Great Dismal Swamp as a stagnant wasteland, early nineteenth-century communities viewed the dense morass as a vital, albeit challenging, sanctuary. Fleeing from nearby plantations, many enslaved people established permanent, self-sufficient settlements deep within the swamp's interior. [1]

The writer wants to add a sentence at Point [1] that contrasts the swamp's role as a refuge for self-determination with the hostile, dehumanizing conditions of the plantations they left behind. Which choice most effectively accomplishes this rhetorical goal?

Strumming My Way

[1]
Last summer, I decided to learn a new musical instrument. Walking into the local music shop, my eyes immediately bypassed the massive guitars and glossy pianos, landing instead on a small, four-stringed instrument: the ukulele. Its compact size and bright, cheerful color felt welcoming. I bought it on the spot.

[2]
Learning the basic chords was surprisingly easy. Within three days, I could play a simple version of my favorite folk song. The nylon strings were gentle on my fingers, unlike the harsh steel strings of my older brother's acoustic guitar. I practiced on our back porch every evening, enjoying the warm breeze.

[3]
By the end of the summer, I was confident enough to perform a short song at a family barbecue. While my playing was not perfect, the cheerful strums brought smiles to my relatives' faces. This small instrument had opened up a whole new world of musical joy for me, proving that you don't need a massive instrument to make a big impact.

Suppose the writer's goal had been to write an essay that describes the historical origins and development of the ukulele as a traditional Hawaiian instrument. Would this essay accomplish that goal?

[1]
In the early nineteenth century, navigating the coastal waters of Europe and North America at night was a perilous endeavor. Existing lighthouses relied on crude metal reflectors and thick glass lenses that absorbed most of the light, casting weak, scattered beams that were barely visible a few miles out. Mariners frequently ran aground because they could not see the warning beacons until it was too late.

[2]
The solution came in 1821 from French physicist Augustin-Jean Fresnel, who designed a revolutionary lens system. Instead of using a single thick, heavy piece of glass, Fresnel assembled a series of concentric glass rings shaped like prisms. These rings bent the light from a central lamp and concentrated it into a single, intense parallel beam. This design allowed the light to travel over twenty miles across the ocean surface, significantly increasing the visibility of the lighthouses.

[3]
Fresnel's invention transformed maritime safety worldwide. Within decades, his lenses were installed in lighthouses across the globe, dramatically reducing the number of shipwrecks and saving countless lives. Even today, despite the advent of modern satellite navigation and radar, many historic lighthouses still employ Fresnel's ingenious design, demonstrating the enduring legacy of his scientific achievement.

Suppose the writer's goal had been to write an essay that describes how a specific scientific innovation directly addressed a historical challenge in transportation safety. Would this essay fulfill that goal?

The Sweet Accident of 1904

During the hot summer of 1904, the St. Louis World's Fair was in full swing, attracting millions of visitors. Among the vendors was Arnold Fornachou, an ice cream seller who was doing a brisk business. The demand for his ice cream was so high that he quickly ran out of clean paper dishes to serve his customers. Without any way to hold the ice cream, his business threatened to grind to a halt.

Directly next to Fornachou's booth was Ernest Hamwi, a Syrian immigrant who was selling zalabia, a waffle-like pastry. Seeing his neighbor's predicament, Hamwi quickly rolled one of his warm, thin waffles into the shape of a cone. He let it cool for a moment so it would harden, and then handed it to Fornachou. Fornachou placed a scoop of ice cream on top of the waffle cone, and the customers loved it.

This spontaneous collaboration marked the birth of the modern ice cream cone. The combination of the cold ice cream and the crispy, edible container solved the vendor's immediate container shortage while creating a lasting culinary sensation. Soon, other vendors at the fair began adopting the idea, cementing the cone's place in popular culture.

Determine whether the following statement is true or false:

Suppose the writer's goal had been to write an essay that describes how a practical problem at the 1904 World's Fair led to the creation of the modern ice cream cone. This goal was successfully met by the essay.

Given the following passage:

In 1925, at the age of fifty-five, Ynes Mexia embarked on her first botanical collecting expedition to Mexico. Over the next thirteen years, she traveled across North and South America, brave enough to confront harsh environments in search of rare plants. Her efforts resulted in the collection of nearly 150,000 plant specimens, including hundreds of new species. In particular, her discovery of a new genus of sunflower, *Mexianthus*, solidified her legacy in the scientific community.

The writer wants to revise the underlined portion ("brave enough to confront harsh environments") to provide the most specific, concrete details that support the claim that Mexia traveled through challenging and remote terrain. Which choice best accomplishes this goal?

[1] In 1766, Jeanne Baret embarked on a global voyage disguised as a male assistant to the naturalist Philibert Commerson. [2] Because Commerson suffered from poor health, Baret had to perform much of the physical labor under demanding conditions. [3] During their stops in South America, she carried heavy equipment while collecting plants. [4] In Brazil, her tireless efforts led to the discovery of a vibrant climbing vine that Commerson named *Bougainvillea* in honor of their expedition commander.

Which of the following choices, if substituted for the bolded portion of Sentence 3, best supports the claim that Baret performed demanding physical labor by providing the most specific, concrete visual details?

A writer is editing a draft of an essay about Mesoamerican agriculture.

[1] The chinampas, an ancient Mesoamerican agricultural system often referred to as "floating gardens," were highly efficient farming plots built on shallow lake beds. [2] By layering mud, decaying vegetation, and reeds, Aztec farmers created nutrient-rich fields that could support multiple harvests per year. [3] ______________ [4] Consequently, this innovative system played a vital role in feeding the rapidly growing population of the Aztec capital, Tenochtitlan.

The writer wants to insert a sentence at point [3] that provides the most specific and concrete detail to support the claim in sentence [2] regarding the productivity of the fields. Which choice best accomplishes this goal?

Yellowstone National Park is famous for its geothermal features, such as geysers and hot springs. Among these, Old Faithful is the most renowned, drawing millions of visitors each year who wait to watch its predictable eruptions.

[1] ____________________. Due to the high concentration of silica in the hot water, a unique glass-like rock forms around the geysers. This mineral crust, known as siliceous sinter, creates the distinct mounds and terraced structures that characterize Yellowstone’s volcanic landscape.

Which choice, if inserted at the blank in Paragraph [1], would most effectively introduce the main topic of the paragraph?

[1] In the early twentieth century, Japanese-American artist Chiura Obata captured the grandeur of the California wilderness through his unique fusion of traditional Japanese ink-painting techniques and Western landscape styles. [2] During his 1927 trek through Yosemite National Park, Obata worked tirelessly to document the dramatic topography. [3] He claimed that the park's natural features possessed a spiritual, dynamic energy that could only be captured through precise, expressive brushwork. [4] To convey this sense of raw energy, Obata focused his attention on the park's most iconic geological formations.

The writer wants to add a sentence after Sentence 4 that provides the most specific, concrete visual detail to support the claim in Sentence 3. Which of the following sentences best accomplishes this goal?

During the monsoon season, the steps of the *baoli* (a traditional Indian stepwell) would be submerged, but as the water level receded during dry months, more levels of the structure were revealed. This seasonal rise and fall made the stepwell a dynamic monument, constantly shifting in appearance. In addition to water storage, the stepwells served as cooling chambers; temperatures at the bottom of the descent could be up to six degrees Celsius cooler than at the surface. Modern mechanical cooling systems, which were invented in the early twentieth century, operate on a different thermodynamic principle entirely. This subterranean drop in temperature made the lower ledges of the wells popular gathering spots where local communities could escape the midday heat.

The writer is considering deleting the underlined sentence. Should the writer make this deletion?

A writer is editing a draft of an essay about aerospace engineer Mary Golda Ross.

[1] As the first female Native American aerospace engineer, Mary Golda Ross made critical contributions to the early space age during her time at Lockheed's top-secret Skunk Works division. [2] Although her initial assignments focused on improving the aerodynamics of fighter jets, she was soon transitioned to the burgeoning space program. [3] There, Ross was tasked with developing design concepts for interplanetary space travel. [4] To ensure the success of these journeys, she formulated mathematical models detailing the trajectories required to navigate the gravitational fields of multiple celestial bodies.

The writer wants to revise the underlined portion of sentence 3 ('design concepts for interplanetary space travel') to provide the most specific and concrete details that illustrate the technical scope of Ross’s interplanetary design work. Which choice best accomplishes this goal?

Mauveine's Moment

[1]
In 1856, eighteen-year-old chemistry student William Henry Perkin was attempting to synthesize quinine, a drug used to treat malaria, in his home laboratory in London. During his experiments, he ended up with a dark, sticky sludge in his beaker. Instead of discarding the failed mixture, Perkin investigated further, dilute-washing the substance with alcohol. To his surprise, the solution turned a vibrant, deep purple color.

[2]
This purple substance, which he eventually named mauveine, was the world's first synthetic organic dye. Before Perkin’s accidental discovery, dyes were derived exclusively from natural sources like plants, insects, and minerals. Producing purple dye, in particular, was labor-intensive and expensive, requiring thousands of Mediterranean snails to yield just a tiny amount of color. Consequently, purple clothing had long been a symbol of extreme wealth and royalty.

[3]
Recognizing the commercial potential of his discovery, Perkin patented the process and established a factory to mass-produce the dye. The new dye was cheap to manufacture, highly colorfast, and easily bound to fabrics like silk and cotton. The demand exploded, sparking a fashion craze across Europe and transforming purple from an exclusive luxury into an accessible color for everyday citizens.

[4]
Perkin’s breakthrough laid the foundation for the modern chemical industry. Scientists began synthesizing other colors, leading to a rapid expansion of industrial chemistry and the development of synthetic pharmaceuticals. Perkin’s accidental sludge changed not only the fashion world but also the trajectory of scientific research.

Suppose the writer's goal had been to write an essay that explains the chemical process used to synthesize mauveine from start to finish. Based on the passage, is the statement that the essay successfully achieves this goal true or false?

The following sentences are from a draft of an essay about forest ecology. To ensure that the paragraph logically builds its claim that trees support one another through fungal networks, in what order should the sentences be placed?

The sentences below are from a draft of a scientific essay about marine camouflage. What is the most logical order for these sentences to ensure that the supporting evidence follows the main claim?

The following sentences are from a draft of an essay about organic chemist Percy Julian. To ensure that the paragraph logically builds its claim that Julian successfully refuted his rival's work, in what order should the sentences be arranged?

[1] In the depths of the ocean, hydrothermal vents support unique ecosystems that thrive completely independent of sunlight. [2] Instead of relying on photosynthesis, the primary producers in these environments—specialized bacteria—utilize chemosynthesis to convert chemical energy from the vents' mineral-rich fluids into organic matter. [3] These chemosynthetic bacteria often form symbiotic relationships with larger organisms, such as giant tube worms, which lack mouths and digestive tracts. [4] Tube worms possess bright red plumes filled with hemoglobin that absorb hydrogen sulfide and oxygen from the water. [5] The bacteria reside inside a specialized organ within the tube worm called a trophosome, where they use the raw materials delivered by the worm's bloodstream to produce nutrients. [6] This elegant partnership demonstrates how life can adapt to survive in some of the most extreme conditions on Earth.

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

During the 2018 restoration of the Prague Astronomical Clock, conservators replaced the replica of the nineteenth-century calendar dial with a new version. The original paintings by Josef Mánes celebrate Bohemian agricultural life. [2] The new replica, however, featured thick, harsh outlines and stylized features that critics argued belonged in a mid-century comic book rather than on a medieval monument.

The writer wants to add a sentence at Point [2] that establishes a clear stylistic contrast between Mánes's original paintings and the newly installed replica. Which choice best accomplishes this goal?