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D. rigidity and shape that's why in plants they stand upright for photosynthetic process.
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Technology such as lenses, magnifying glasses, and microscopes had an impact on the development of the cell theory. Below are some examples of how such technologies contributed to the cell theory. Robert Hooke is accredited with observing the first cells in 1665. ... He used lenses to make the discovery.
Gene duplication, mutation, or other processes can produce new genes and alleles and increase genetic variation. New genetic variation can be created within generations in a population, so a population with rapid reproduction rates will probably have high genetic variation.