Alleles. Alleles are the "same" genes, but provide a variation of the intended function.
I believe it is a 2:1 ratio of hydrogen to oxygen, because the way i learned was that carbon hydrogen and oxygen have a ratio of 1:2:1, respectively.
Mitosis is responsible for the growth of a eukayotic cell. during mitosis a cell divides and to 2, unlike meiosis which divides in to 4. mitosis is the asexual reproduction of cells, such as hair ,skin and nail cells.
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constructing dams and building desalination plants help reduce the effects of droughts
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Levels of organization in ecology include the population, community, ecosystem, and biosphere. An ecosystem is all the living things in an area interacting with all of the abiotic parts of the environment.
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Hope this helps! :)