Is variation always caused by the surroundings?

Some variation is the result of differences in the surroundings, or what an individual does. This is called environmental variation.

Question:

Is variation always caused by the surroundings?

Some variation is the result of differences in the surroundings, or what an individual does. This is called environmental variation.

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this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.

they absorb it i think

not sure

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