Eukaryotic cells have a nucleus and Prokaryotic cells do not.
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Cell Wall: This is the rigid outermost layer of a plant cell. It makes the cell stiff -providing the cell with mechanical support - and giving it protection. Animal cells do not have cell walls. Cell Membrane: This is a protective layer that surrounds every cell and separates it from its external environment.
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Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them
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Imagine that to be able to roll your tongue you need two genes, A and B. For each of There is a certain dominant version for each of these genes that lets you roll your tongue. cannot roll their tongue would have a tongue roller for a child. Another example is something called a modifier gene
