The process by which natural selection produces a divergence in traits and resource use among sympatric species is called displacement.

ability to bond woth oxygen

youre right there are

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.

sex cells are usually half's then they find another half and make a fertilize egg