Scientists often use experiments to test their ___, which are possible explanations for observations.

A set of related hypotheses that are supported by evidence may become accepted as a ___.

A hypothesis must be stated in a way that makes it __________.

In a ___ only one variable is changed at a time.

A scientist who wants to study the possible side affects of a new medicine would probably ___.

Science deals only with the _____.

In a controlled experiment ___.

In today's world, scientists form a global community. This means that ___.

The set of skills or steps that scientists use to answer questions is the ___.

Scientists propose ___ that can be ___ by examining evidence.

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