Question

Read the following passage, then match each research approach or hypothesis regarding the Ediacaran biota (on the left) with the author's evaluative attitude toward it (on the right).

The Ediacaran biota, a collection of enigmatic fossil organisms dating from immediately before the Cambrian explosion, represents one of the most perplexing puzzles in evolutionary biology. Because these organisms lack the hard parts typical of later fossils, preserving only as impressions in sandstone, their biological affinities remain intensely debated.

For decades, the dominant paradigm, pioneered by Martin Glaessner, held that Ediacaran organisms were the direct Precambrian ancestors of modern animal phyla. Glaessner painstakingly mapped the flattened, quilted impressions of fossils like Dickinsonia onto the body plans of modern annelid worms and jellyfish. While this phylogenetic mapping provided a comforting sense of evolutionary continuity, it requires a significant leap of faith. The morphological similarities are largely superficial, and reading modern anatomical structures into these compressed two-dimensional imprints strains credulity. Consequently, Glaessner’s direct-ancestor model warrants cautious reservation, serving better as a historical baseline than a definitive framework.

In sharp contrast to Glaessner, paleontologist Adolf Seilacher proposed the "Vendobionta" hypothesis, arguing that the Ediacaran organisms were an entirely extinct kingdom of life, a "failed experiment" in evolution that shared no common ancestry with modern animals. Seilacher contended that their quilted construction, resembling an air mattress, functioned to maximize surface area for absorbing nutrients in a tranquil marine environment. This conceptualization is undeniably brilliant in its structural analysis. However, it ultimately proves too extreme in its categorical isolation of the Ediacaran biota; recent biomarker discoveries of cholesterol in Dickinsonia fossils decisively link them to the animal kingdom, undermining the necessity of a separate kingdom.

Given the inherent limitations of purely morphological comparisons—which often devolve into subjective Rorschach tests—paleontologists have increasingly turned to functional analysis. The recent methodological pivot by researchers like Xiao and Laflamme, who utilize computational fluid dynamics to model how water flowed around these organisms, represents a transformative breakthrough. By simulating the feeding mechanisms of organisms based on their three-dimensional topology, this approach bypasses the fraught endeavor of mapping them onto modern phyla. This functional methodology provides the most robust path forward, anchoring Ediacaran paleontology in the rigorous laws of physics rather than the shifting sands of visual analogy.