The faster moving molecules in a warm object collide with the slower moving molecules in a cold object.
I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
Answer:
darn no one answered ... how sad
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because they think god want them to convert people into cath
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may be speaker A must be the answer
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mark me as brainliest if it helped you and thank me later
