Paleontologists are scientists who study the fossil record. They can use the fossil record to identify a common ancestor. What is a common ancestor?
A) species that became extinct as the environment changed
B) species that left a complete history of its existence in the fossil record
C) species from which two or more species evolved
D) species that suddenly appears in the fossil record and then just as quickly disappears
Ans: C) species from which two or more species evolved
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Which substance is not released by plant roots to enable and improve access to particular nutrients in the soil?
a. amino acids b. carbohydrates c. enzymes d. fatty acids e. carbon dioxide
Which of the following varies rhythmically with respiration?
A) atmospheric pressure only B) intrapleural pressure only C) intra-alveolar pressure only D) both intrapleural pressure and intra-alveolar pressure E) both atmospheric pressure and intrapleural pressure
All of the red squirrels living on a college campus would be a(n)
A) genus. B) family. C) population. D) ecosystem. E) community.
A change in allele frequencies due to random chance is termed ________.
a) natural selection b) genetic equilibrium c) genetic drift d) gene flow