An Anthropologist Discovers the Fossilized Heart of an Extinct Animal

question 40

Multiple Choice

An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, well-formed, and had four chambers, with no connection between the right and left sides. A reasonable conclusion supported by these observations is that the

• A) animal had evolved from birds.
• B) animal was endothermic and had a high metabolic rate.
• C) animal was most closely related to alligators and crocodiles.
• D) animal was likely an invertebrate animal.
• E) species had little to no need to regulate blood pressure.

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Definitions:

Type B Personality

A personality contrast to Type A, characterized by a more relaxed, patient, and stress-free approach to life and work.

Type D Personality

A disposition marked by high levels of negative emotions and social inhibition; "D" stands for "distressed."

Antigens

Substances, often proteins, on the surface of pathogens, foreign cells, or tissues that trigger an immune response in the body.

Bacteria

Microscopic, single-celled organisms found in diverse environments, some of which can cause diseases while others can be beneficial.