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
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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
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
The ________ zone is a range of environmental temperatures within which homeothermic metabolic rates are minimal
Fill in the blank(s) with correct word
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.