The graph below shows the energy associated with a chemical reaction. The activation energy decreases once a certain type al molecule is added What type of molecule causes the activation energy to decrease as shown in the graph?

Liquid
protein
nucleic acid
carbohydrate

Complete the statements to identify the first two steps of meiosis i. (1 ) the first and longest step of meiosis i is called i. (2)the second step of meiosis i is called i.

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food