An anthropologist discovers fossilized animal remains that give strong evidence that the organism had a large, well-formed, most likely 4-chambered heart, with no connection between the right and left sides. Which of the following could most reasonably be hypothesized from this observation?
A)that the animal and its relatives had evolved from birds
B)that the animal had a high energy requirement and was endothermic
C)that the animal was most closely related to reptiles such as alligators and crocodiles
D)that the animal was a kind of invertebrate
E)that the species had little to no need to regulate blood pressure

Question

Quizplus · Accepted Answer

A large, well-formed, most likely 4-chambered heart with no connection between the right and left sides is characteristic of endothermic animals, which have high energy requirements. Therefore, the most reasonable hypothesis is that the animal was endothermic.

An Anthropologist Discovers Fossilized Animal Remains That Give Strong Evidence