3333 Which statement describes one feature of a mineral's definite chemical composition?
It always occurs in pure form.
It always contains certain elements.
It cannot form from living or once-living materials
It cannot contain atoms from more than one element

individual oxygen atoms are formed during photosynthesis.-c.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the correct answer is:

a population changes in response to a change in the environment.

i believe it would be c: tons.