24) an example of effector’s roles in homeostatic responses is observable when A

ID: 270504 • Letter: 2

Question

24) an example of effector’s roles in homeostatic responses is observable when

A) an increase in body temperature resulting from involuntary shivering.

b) an increase in body temperature resulting from exercise.

C) the rising sun causes an increase in body temperature in a stationary animal.

D) an decrease in body temperature resulting from fever.

25) arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that

A) arthropods evolved before vertebrates did

b) arthropods have had more time to coevolve with land plants than have vertebrates.

C) extant terrestrial arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates.

D) ancestral arthropods must have been poorly adapted to aquatic life, and thus experienced a selective pressure to invade land.

26) you have before you a living organism. Which you examine carefully. Which of the following should convince you that the organism is acoelomate?

A) it is triploblastic.

B) it has radial symmetry

c) in cross section the muscle layer is continuous between the ectoderm and endoderm

D) it possesses sensory structures at its anterior end.

24. A) an increase in body temperature resulting from involuntary shivering.

Shivering happens to maintain homeostasis.

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