A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. It seems to change little over several million years, then is extinct. This illustrates the concept of

A. punctuated equilibrium.
B. gradualism.
C. developmental evolution.
D. anagenesis.
E. evo-devo.


B. gradualism.

Biology & Microbiology

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Fairy shrimp that are found in deserts tend to have very drought-resistant eggs that can remain

dormant for many months. Which of the following disturbances might have a positive effect on seasonal reproduction in fairy shrimp?

a. fire b. drought c. flooding d. introduction of an invasive predatory fish

Biology & Microbiology

Chance changes in a gene pool are known as ____

a. artificial selection b. genetic drift c. phenotype variations d. inheritance e. acquired characteristics

Biology & Microbiology

Oxygen kills some bacteria because of the production of _______

a. carbon dioxide b. oxygen free radicals c. a sodium cation d. water

Biology & Microbiology

Which statement about glycolysis is false?

A) It results in the oxidation of glucose. B) It requires oxygen. C) It occurs in the cytoplasm of the cell. D) It generates ATP. E) It leads to the formation of pyruvate.

Biology & Microbiology