When evolutionary biologists study the process of natural selection they focus on:
a. what drives mutations.
b. how some trait of interest changes over time.
c. how some trait of interest remains constant over time.
d. A and B.
e. B and C.
E
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A horseshoe-shaped crown of tentacles used by many invertebrates for feeding is called a
A. protostome. B. fimbrium. C. lophophore. D. trochophore. E. rhizophore.
An individual's ____ determines its observable ____
a. phenotype; genotype b. genotype; phenotype c. gene location; allele d. heterozygote; homozygote e. homozygote; heterozygote
In a scientific experiment, the group that does not receive the experimental treatment is called the placebo group
a. true b. false
In which group of organisms has the timing of spring events changed the most in response to climate change?
A) birds B) butterflies C) amphibians D) trees