Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results.
Explanation:
I am 12 years old
You posted a Biology question on English Haha
a. realize
realize sounds the most natural because the next sentence talks about how he finds out about it. which is REALIZE
cool people should be other people. and put help the environment in there teachers love it guaranteed good grade.