What mountain ranges on Earth would require you to take oxygen with you to reach the peak? Find at least two mountains. Be sure to include their elevations as well.

i think it is dna, i'm not totally sure but i think it might be.

not sure if this what   you'r looking for would be percent composition

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.

the fossil record provides evidence of a common ancestor to many species.