The end of the Permian period was characterized by a mass extinction of
A) shallow-water marine invertebrates.
B) dinosaurs and other large reptiles.
C) small mammals.
D) large mammals.
A
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The core of the intestinal microvillus is composed of a tight bundle of ________.
Fill in the blank(s) with the appropriate word(s).
Fungi reproduce sexually less frequently than asexually. What might be the reason behind this infrequency of sexual reproduction?
A. Sexual reproduction is more energy-intensive than asexual reproduction. B. Sexual reproduction requires two genetically different strains of the fungus to come together. C. In asexual reproduction, one parent divides. D. All statements are true.
What structural characteristic allows sac fungi and club fungi to include larger-bodied species than other fungal groups?
What will be an ideal response?
The prostate:
A. is fairly large at birth but shrinks markedly during puberty. B. secretes a milky alkaline fluid that is part of the ejaculate. C. cannot be felt in a rectal examination. D. is composed entirely of glandular tissue.