What can you conclude from the fact that more than a billion species have gone extinct during earth's history? a. extinction is a natural part of life on earth b. extinction happens only rarely c. the rate of extinction has increased since humans evolved d. the earths environment is not good at supporting life

What is the relation ship between structure and function in an organism

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.

Which list is in order from simplest to most complex? a bacteria - virus - plant - protist b protist - bacteria - virus - plant c virus - bacteria - plant - protist d virus - bacteria - protist - plant