Which of the following is considered a keystone species within Yellowstone National Park?

a. beavers
b. wolves
c. elk
d. cottonwood


b. wolves

Biology & Microbiology

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When scientists experimentally simulated conditions near a hydrothermal vent, _____ appeared within a week

a. cells b. nucleic acids c. hydrocarbons d. amino acids e. lipid membranes

Biology & Microbiology

Reshaping the cornea using lasers is often used to treat

a. astigmatism. b. retinoblastoma. c. myopia. d. glaucoma. e. cataracts.

Biology & Microbiology

The most likely explanation for any mass-extinction event is

A) a gradual increase in global temperature. B) coevolution of predator and prey species. C) loss of genetic diversity due to inbreeding. D) human activity. E) rapid environmental change.

Biology & Microbiology

Development occurs:

A) only in non-dividing cells. B) only during growth of the organism. C) throughout the life of the organism. D) only in animals.

Biology & Microbiology