Approximately twenty-five elements
are in the periodic table of elements
o occur naturally on earth
o are in the human body

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

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.