Collagen in the human body connects and supports bodily tissue such as skin, bones, muscles and cartilage. It supports the internal organs and can even be found in teeth! Collagen's main function is to sustain tendons, skin, and cartilage and provide firmness and elasticity to those structures.
greenhouse gases can cause Earth's atmosphere to trap more and more heat. This causes Earth to warm up.
I think the answer is 7mm but I'm not sure.
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