At the end of which period did nearly three quarters of all species of life on earth go extinct in a very short time interval cambrian jurassic triassic cretaceous

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.

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.