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
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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.
The Montreal Protocol banned use of _____ , which contribute(s) to ozone depletion
a. DDT b. CFCs c. fossil fuels d. sulfur dioxides
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
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