The low energy demands of nematodes allow them to survive without a

A) skeleton.
B) reproductive system.
C) respiratory system.
D) body cavity.
E) tubular gut.


C

Biology & Microbiology

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A change in behavior related to a stimulus and response is

A. aversiveness. B. associative learning. C. habituation. D. orientation. E. aversiveness and habituation.

Biology & Microbiology

If the sunflowers represent 2400 calories, how many calories would be lost as heat as you

move from the first to the second trophic level?

a. 240 b. 2160 c. 90 d. 10

Biology & Microbiology

In a well-stratified lake in summer, the subsurface layer of water, which is characterized by a steep and rapid decline in temperature with depth, is called the

A) epilimnion. B) metalimnion. C) hypolimnion. D) benthic zone.

Biology & Microbiology

The vesicles that are anchored to the plasma membrane at a nerve cell presynaptic site are specialized for

A) constitutive secretion. B) regulated secretion. C) polarized secretion. D) lysosome secretion. E) endocytosis.

Biology & Microbiology