Question

why do experiments need to be repeatable?
a. if something is seen only once, everyone will believe it.
b. experimental results are not reliable if they are not repeatable.
c. science is always changing, so experiments need to be repeated.
d. scientists will not accept data they did not collect themselves.

Explanation:

In science, repeatability is crucial. If an experiment can't be repeated, it's hard to confirm the results. Option B correctly states that non - repeatable results lack reliability. Option A is incorrect as seeing something once doesn't mean everyone believes it. Option C is wrong because science changing isn't the main reason for repeatability. Option D is false as scientists can accept data from others if it's repeatable.

Answer:

B. Experimental results are not reliable if they are not repeatable.