A phylogenetic event horizon is:
a. a point in the future in which species will diversify.
b. a phylogeny based on extinct species.
c. the point at which life started.
d. a point in the history of life beyond which phylogenetic analysis cannot see.
D
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Which one of the following marine ecosystems would be expected to have the lowest species diversity and primary production per unit area?
A. oligotrophic oceans B. upwelling regions of ocean C. coral reefs D. estuaries E. intertidal zone
In the United States, about __________ teenagers
join the ranks of habitual smokers each day. a. 1,000 b. 2,000 c. 3,000 d. 4,000 e. 5,000
Every polypeptide chain synthesized from RNA starts with which amino acid?
a. Arginine b. Phenylalanine c. Methionine d. Leucine
An increase in urine production could cause
A. an increase in blood volume. B. a decrease in blood volume. C. an increase in blood pressure. D. both an increase in blood volume and an increase in blood pressure. E. both a decrease in blood volume and an increase in blood pressure.