Answer:
Green house effects
Explanation:
This is when gases are trapped in the earth's atmosphere and make the earth warmer
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Answer:
Questionnaires
Explanation:
They allow both government and outside researchers to obtain estimates of a variety of health related topic or issue among either the entire nation or specific demographic group of the population.
And the survey design is cross section.
Answer:
Function as one unit and relate to internal organ processes
Explanation:
Smooth muscles apply pressure to vessels and organs inside the body to keep it alive, an example is involuntary processes such as breathing.