2. What are the main structures of the nervous system?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays