"A scientific theory is: Select one: a. an educated guess. b. a guess about how or why something happens. c. a statement that describes what always happens under certain conditions in nature. d. an explanation for events that are generally accepted as true."

C

Explanation:

A scientific theory is an explanation of an aspect of the natural world and universe that has been repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. ... Theories are structures of ideas that explain and interpret facts."

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.