What is the main difference between an ecosystem and a community?
A. A community and an ecosystem are the same thing in eology
B. A community consists of nonliving components, while an ecosystem consists of living organisms
C. A community consists of both living organisms and their nonliving environment, while an ecosystem consists of nonliving components only
D. A community consists of living organisms only, while an ecosystem consists of both living organisms and their nonliving environment
Answer: D
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Most researchers studying humans distinguish between ___ aggression, which is impulsive and emotional, and ___ aggression, which is premeditated and relatively emotionless.
A) offensive, reactive B) reactive, predatory C) reactive, proactive D) affective, predatory
Which of the following is NOT true of
gametophytes? a. They are haploid plants. b. They produce gametes. c. They are the result of sexual reproduction. d. They are a stage in the life cycle of plants. e. Their gametes are either male or female.
The target cells for hormones
a. have special receptor sites. b. are not located in roots. c. are no different from any other cells. d. are located in the interior of the plant. e. include all of these descriptions.
Since the membrane is more permeable to K+ than to Na+,
Select one: a. there are always more positive ions outside the membrane than inside. b. there are always more negative ions outside the membrane than inside. c. the outside of the membrane is always negative. d. the outside of the membrane is always neutral. e. there really is never a resting potential. Feedback