Skin is the human body's largest organ. Body organs aren't all internal like the brain or the heart. There's one we wear on the outside. Skin is our largest organ—adults carry some 8 pounds (3.6 kilograms) and 22 square feet (2 square meters) of it. This fleshy covering does a lot more than make us look presentable.
it’s gravity holds the solar system together keeping everything from the biggest planet to the smallest particles of debris in its orbit the connection and interactions between the sun and earth drive to seasons ocean current weather climate radiation belt and auroras
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Charles Darwin was a naturalist from the 1800's. He developed the theory of natural selection which became the foundation of modern evolutionary studies. Natural selection is the survival and reproduction of individuals and how they adapt.