Explain the anthropogenic (man-made) impact on the carbon cycle.

Mass deforestation causes much more carbon to be released into the atmosphere because all living things have carbon inside them. When they are cut or killed, the carbon inside them is released.

Cars and their emissions contribute to much of the carbon released into the atmosphere. The exhaust is carbon.

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.