a) All chipmunks that could fly left island
b) Natural Selection no longer favoured those chipmunks that could fly
c) The chipmunks had no chance to fly so the “flight membranes” shrivelled up
d) Young chipmunks were not taught to fly by their parents, so their flight membranes did not develop

protist eukaryotes that are not plants, animals, or fungi ("misfits")

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.