When science alters or clones genes and inserts them into an existing strand of DNA to make a new trait is know as: O selective breeding
O genetic engineering
O natural selection
O gene therapy

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

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