why is oxygen important for all body cells?
a)it is involved in sugar production
b)it reduces the amount of urea in blood.
c)it increases the formation of lactic acid.
d)it is involved in energy producing cycles.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water