Which of the following are the deep crevices of the brain surface that separate the different lobes of the brain?

A. topographical features
B. cortexes
C. sulci
D. the corpus callosum


C

Biology & Microbiology

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Which of the following plant hormones stimulates development of an abscission zone in the leaf petiole?

A. ethanol B. gibberellins C. abscisic acid D. auxin E. ethylene

Biology & Microbiology

When the body's defenses turn against its own cells, the disorder is called

a. an autoimmune response. b. anaphylactic shock. c. acquired immune deficiency syndrome. d. passive immunity. e. an inflammatory response.

Biology & Microbiology

What percentage of the world's tropical forests has been cut down for cropland, fuel wood, grazing land, and timber?

a. 20 percent b. 30 percent c. 40 percent d. 50 percent e. 60 percent

Biology & Microbiology

The growth rate of a population is the difference between the population size and the death rate

Indicate whether the statement is true or false

Biology & Microbiology