Your answer should be the Miklankovitch cycles. Lmk if I'm wrong!
The heart, blood vessels and blood itself are three essential components the body needs to survive. The circulatory system consists of two circuits that blood travels through; pulmonary and systemic.
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Half of Earth's water may have come from ancient asteroid collisions Asteroid samples returned to Earth in 2010 provide new evidence of an extraterrestrial origin for half the planet's water.
Explanation: