Peter Sheldon found that the number of tail "ribs" in ____ changed over a 3 million year period with no evidence of speciation.
A) horses
B) trilobites
C) insects
D) humans
E) ectoprocts

Question

Quizplus · Accepted Answer

Peter Sheldon's research focused on trilobites, specifically documenting how the number of tail "ribs" in these ancient marine arthropods changed over a 3 million year period without any evidence of new species emerging, illustrating an example of gradual evolutionary change.

Peter Sheldon Found That the Number of Tail "Ribs" in ____