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All cells hace a barrier around them that separates them from the environment and from other cell.The barrier is called the plasma membrane,or cell membrane.
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sorry wish I could help I just don't understand it ??
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There is no actual way that the mantle could be...'exposed' or 'seen'. But scientists have managed to find multiple ways to analyze the mantle and it's actual existence by using multiple devices. The mantle is basically a 2,900 kilometers (1,802 miles) thick blocks of rocks and minerals underneath the crust(or the surface of the earth) , and makes up a whopping 84% of Earth's total volume.
Tiger frogs have similarities in their mitochondrial DNA that are not shared by other frog species
Crystal is a material growing inside out oppose to a bird that is hatched from an egg