Which cell structures are sometimes found attached to the endoplasmic reticulum

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

What are 3 reasons that natural selection occurs

According to the article, what valid claim came from the national research council? there is no association between fluoride exposure and increased cancer risk in humans. there is a possible link between fluoride exposure and increased cancer risk in humans. there is a definite link between fluoride exposure and increased cancer risk in humans.