Which of the following essential amino acids is used by the body to produce tyrosine? Leucine
O Lysine
Isoleucine
Valine
O Phenylalanine
Octan 57

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.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.