What mechanism explains evolution by discussing variations in a population that allow it to match its environment?

a. Artificial selection
b. Origin of species
c. Beneficial adaptations
d. Natural selection


d

Biology & Microbiology

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The internal skeleton of echinoderms is made of calcium-stiffened ____ that develop from mesoderm

a. ampullae b. ossicles c. radial canals d. ring canals e. madreporites

Biology & Microbiology

Red muscle appears that way due to the presence of

a. hemoglobin. b. iron. c. myoglobin. d. ATP. e. glucose.

Biology & Microbiology

Why is ecology considered an interdisciplinary science?

A) It involves a large expanse of various species. B) It involves and draws from various fields of science such as geology, hydrology, and meteorology. C) It encompasses the field of environmental science. D) It includes the study of human population growth.

Biology & Microbiology

The free-swimming adult stage of many cnidarians that reproduces sexually is a 

A. larva. B. polyp. C. medusa. D. zygote.

Biology & Microbiology