Astudentt observe a fish resting in the classroom fish tank . the fish mouth was openning and closing regulary as it pumped water over its gills . why was the fish pumping water over its gills ?

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you got this this :)

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.