Some of the characteristics used to describe biomes include:
A. precipitation and number of grass species.
B. precipitation and average temperature.
C. precipitation and number of trophic levels
in the communities.
D. precipitation and species richness.
B
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Genetic drift has an especially significant effect in what kind of populations?
A. populations that are large B. populations that are small C. populations with high genetic variability D. populations that are in Hardy-Weinberg equilibrium E. populations that are migrating
True or false: Natural selection is always the driving force of speciation
A. true B. false
The lymphatic system returns ____ liters of fluid to the bloodstream each day
a. 1 to 2 b. 3 to 4 c. 6 to 7 d. 10 to 13 e. more than 50
Among prokaryotes, there are some that can live in every environment on earth.
a. true b. false