The ultimate source of genetic variation within a population is:
a. mutations in DNA.
b. adaptation of a species to environmental changes.
c. homeostatic mechanisms that compensate for environmental changes.
d. a sensory system that can detect an environmental change.
e. a system of locomotion that allows an organism to escape environmental changes.
A
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The famous Cambrian-era fossil deposit known as the Burgess Shale is now estimated to contain fossils of how many animal phyla?
A) None?animals had not appeared at the time. B) just two or three anatomically simple animal phyla C) about the same number as those alive today D) two or three times as many as alive today E) about half as many as are alive today
Which of the following are symbiotic with corals?
A) polyps B) zooxanthellae C) silica D) clownfish
Pairs of chromosomes that have the same size, shape, and function are ________.
What will be an ideal response?
________ are archaea that live in hot, acidic springs.
A. Methanogens B. Thermotrophs C. Acidotrophs D. Thermoacidophiles