Comparing the chromosomes of chimpanzees and humans has revealed that the two species
A) should be classified in the same species.
B) should be classified in the same genus.
C) are closely related.
D) are only distantly related.
E) should not be classified in the same family.
C
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The cuticle is
A. the name of the organic molecules that flow through the xylem. B. the tough, complex molecule that forms secondary, rigid cell walls in sclerenchyma cells. C. None of the answer choices is correct. D. the structure that is built up around guard cells, for opening the stomata. E. a waxy layer on the epidermis, for conserving water.
In insects and spiders, __________ take up fluid,
uric acid, and solutes from the blood and deliver them to the gut. Fill in the blank(s) with the appropriate word(s).
Another term for a hermaphroditic species is _____________.
a) homogametic b) monoecious c) dioecious d) haploid
Of all the species that have ever lived on Earth, how many have gone extinct?
A. Less than 1% B. About 10% C. About 25% D. About 75% E. About 99%