Relate photosynthesis to the amount of carbon dioxide in the atmosphere.

high rate of photosynthesis reduces the amount of co2 in the atmosphere or high conc of co2 in the atmosphere increases rate of photosynthesis.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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