Apossible explanation for a set of facts that can be tested by further investigation is called a blank

Answer;

Hypothesis

Explanation;

A hypothesis  is a tentative explanation that accounts for a set of facts and can be tested by further investigation. Scientific hypotheses must be posed in a form that allows them to be tested.

- It represents a possible explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. Once you do the experiment and find out if it supports the hypothesis, it becomes part of scientific theory. An example of a hypothesis; Hypothesis: Bacterial growth may be affected by temperature.

hypothesis is the blank

car a and b are moving in opposite directions

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the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.