Energy flow in an ecosystem is

a. cyclical.
b. one-way.
c. two-way.
d. reversible under different conditions.
e. dependent on the organisms in the ecosystem.


B

Biology & Microbiology

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Which of Lamarck's ideas was the least influential to Darwin’s evolutionary theory?

a. Species change through time. b. New characteristics are passed from one generation to the next. c. Organisms change in response to their environment. d. Acquired characteristics are passed on from parents to offspring. e. Specific mechanisms exist that foster evolutionary change.

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Mitosis in mammals usually takes less than an hour

Indicate whether the statement is true or false

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Which of the following is(are) part of the central nervous system?

A) motor system B) brain and spinal cord C) brain only D) spinal cord only

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If a human zygote has either 45 or 47 chromosomes it was caused by nondisjunction.

a. true b. false

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