Enzymes affect the reactions in living cells by changing the A( products of the reaction
B( speed of the reaction
C( pH of the reaction.
D( temperature of the reaction

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d