A certain structure in a cell that serves a certain purpose or function.
The body cell has more genetic information. A gamete only has half the information of a body cell. So when two gametes combine (a sperm and an egg), together they provide the child with all the genetic information needed for its body cells.
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The statement that forms the best testable hypothesis for this question, would be 2. I believe.
Answer:
He should only change the wavelength of light for each group
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