Question

in science, what is a theory? a scientific explanation that is backed up by some evidence a scientific explanation that is backed by a lot of evidence an educated guess as to what will happen in an experiment an educated guess that is backed up by some evidence

Explanation:

A scientific theory is a well - established and comprehensive scientific explanation. It is not just a guess (so options with "educated guess" are incorrect). Also, it is not just backed by some evidence but a large body of evidence from multiple sources and experiments.

Answer:

B. A scientific explanation that is backed by a lot of evidence