The highest number of individuals in the
United States are in the ___ age structure
category.
a. pre-reproductive
b. early reproductive
c. late reproductive
d. early post-reproductive
e. late post-reproductive
C
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What class of neurons in the central nervous system sends commands to muscles?
A. afferent neurons B. efferent neurons C. peripheral neurons D. interneurons
That some organisms contain much larger amounts of DNA than are apparently "needed" and that other relatively closely related organisms may have vastly different amounts of DNA is more typical in ________
A) the alphoid rather than the diphloid family B) eukaryotes than in prokaryotes C) RNA viruses than in DNA viruses D) viruses than in bacteria E) prokaryotes than in eukaryotes
©McGraw-Hill EducationBased on the phylogeny shown, the group of species including (2-5) can best be described as a
A. polyphyletic group. B. synapomorphy C. clade. D. cladogram. E. paraphyletic group.
Black-bellied seedcrackers have either small beaks (better for eating soft seeds) or large beaks (better for hard seeds). There are no seeds of intermediate hardness; therefore, which kind of selection acts on beak size in seedcrackers?
A. Stabilizing selection B. Directional selection C. Disruptive selection