Which rock layers show erosion ?

of those who start drinking before they're 15 will develop alcohol dependence

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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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.