Asteroids Hitting Earth May Result in Mass Extinctions

question 1

True/False

Asteroids hitting Earth may result in mass extinctions.

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Definitions:

Incidence

The rate or frequency at which a new event or case occurs in a specific population over a certain period of time.

Internally Valid

The extent to which a research study provides evidence of a cause-and-effect relationship between variables, within the context of the study.

Confounds

Variables that researcher failed to control, or eliminate, damaging the internal validity of an experiment by providing alternative explanations for outcomes.

Experimental Manipulation

The deliberate alteration of the independent variable in an experiment in order to learn about its effects on the dependent variable.