birds with smaller beaks struggled to eat the large seeds and often gave up. Based the data provided, is there evidence to demonstrate the beak depth is a product of natural selection?

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.

i think the answer would be a. after sentence 14! i hope i at least a little