Carbon, an important element for life, keeps cycling between the spheres of the earth. carbon dioxide in the is absorbed by the oceans and is used by aquatic organisms for biological processes. but aquatic organisms return some of it back through .

Importance: all living organisms need/use water, can be used for ... a process where matter is recycled through specific interactions between biotic and that carbon dioxide is released by breathing out and is returned back to the atmosphere. ... not let heat escape) enters Earth's atmosphere and provides light energy

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.

wegner's theory did not explain how the continents could move

explanation: