Cellular respiration is an example of when a minimum amount of energy is needed for a chemical reaction to begin. * 2 points
Atomic Theory
Conservation of Mass
Activation energy
Covalent Bond

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?