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fossils are remains of animals that died and were buried by ground for millions of years. The fossil bed is the area of where is has died and the terrain around it

Explanation: that was the answer and explanation

the answer is "a.) well–developed vascular system."

explanation:

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.