The periderm
a. replaces the epidermis when some plants age.
b. is a protective tissue.
c. is a dermal tissue.
d. is found on the surface of woody plants.
e. fits all of these descriptions.
Answer: e
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In the rumen, food is quickly attacked by cellulase
A. enzymes produced by microbes. B. archeons. C. enzymes produced by both the ruminant and the microbe. D. enzymes produced by the ruminant.
In flatworms, the action of ciliated __________ draws interstitial fluid into a system of tubes that
delivers it to the body surface. Fill in the blank(s) with the appropriate word(s).
In central Africa, the frequency of the sickle-cell allele has remained stable over the years because the allele protects against malaria. In the United States, malaria was eradicated by eliminating the mosquito that spreads the disease
The decreasing frequency of the sickle-cell allele in African Americans since malaria was eliminated in the United States is an example of A) stabilizing selection. B) genetic drift. C) the founder effect. D) disruptive selection. E) directional selection.
The type of muscle tissue that can be under our conscious control is:
A) smooth and cardiac. B) skeletal and smooth. C) skeletal. D) smooth. E) cardiac.