Tissues and organ systems evolved as a result of ____
a. cooperation between different species of cells
b. colonies of numerous species of cells
c. endosymbiotic eukaryotes
d. genome evolution in colonial cells with specific functions
e. intracellular signals leading to cells with specific functions
ANSWER: d
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Which feeding tactic is most associated with a large-toothed, predatory carnivore?
A. suspension feeder B. food-mass feeder C. deposit feeder D. fluid feeder
What percentage of the surface of the earth is covered by seawater?
a. 46% b. 55% c. 64% d. 71% e. 83%
How much larger do eukaryotic cells tend to be than prokaryotic cells?
a. 150–1000 times larger b. 10–100 times larger c. 5–10 times larger d. 1000 times larger or more
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago