What does the term theory mean to a scientist?

A) A guess
B) A proposed explanation for an observed phenomenon
C) A hypothesis that has been supported by the evidence of an experiment
D) A broad hypothesis that has been supported by a large number of experiments


D

Biology & Microbiology

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Cross-pollination occurs within a single plant while self-pollination occurs between two plants

Indicate whether the statement is true or false.

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The Montreal Protocol banned use of _____ , which contribute(s) to ozone depletion

a. DDT b. CFCs c. fossil fuels d. sulfur dioxides

Biology & Microbiology

Researchers introduce DNA into plants by

using I. bacteria II. electric shocks III. chemical shocks

a. I only b. II only c. III only d. II and III e. I, II, and III

Biology & Microbiology

Ideally, what should an experiment studying the effect of a cold medicine have?

A) no control group B) double-blind procedures C) a small sample size D) subjects of only one gender

Biology & Microbiology