The proposal that one type of organism can change gradually into another type over a long period of time is known as

A. preconception.
B. evolution.
C. natural history.
D. preservation.


Answer: B

Biology & Microbiology

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Which of the following characteristics is not associated with cardiac muscle?

A) intercalated discs B) contracts spontaneously C) involuntary D) pointed ends E) striations

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Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the ____

a. symplastic pathway only b. transmembrane and symplastic pathways c. transmembrane pathway only d. apoplastic, transmembrane, and symplastic pathways e. apoplastic pathway only

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The ________ zone is a range of environmental temperatures within which homeothermic metabolic rates are minimal

Fill in the blank(s) with correct word

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The central nervous system contains:a

all sympathetic nerves. b. all parasympathetic nerves.

c. all sensory receptors. d. only the cerebrum and cerebellum. e. a brain and a dorsal tubular spinal cord.

Biology & Microbiology