Horse breeders often mate horses that have special traits that they will pass on to offspring. this is an example of
survival of the fittest
evolution
artificial selection
natural selection

artificial selection

Explanation:

When the breed is physically created to promotes best traits the process is artificial because it is humanly hand picked .

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.