Current cell theory:
1) mitochondria are found only in animal cells
2) cells are very different in structure from one cell to another
3) chloroplasts are found in all cells
4) other than the very first cell, cells come from preexisting cells

Describe at least 2 abiotic and two biotic factors found in the desert biome how do these abiotic factors interact with the biotic factors

Contrast how pollination is different among gymnosperms and angiosperms.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.