What is suggested by the similarity of early embryos of different species of vertebrates?
recent common ancestry
similar environments in the past
evolution from a distant common ancestor
no evolutionary relationship between the groups

wheres the answers ?

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.

cells spend most of their time in interphase