D, because the atomic mass number for carbon is 6
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Highly conserved regions are a gene that are extremely similar among different species
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Stomata and Cuticle because it covers the outer surface of the plant and prevents drying out through evaporation.
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During the summer months, the water table tends to fall, due in part to plants taking up water from the soil surface before it can reach the water table. The water table level is also influenced by human extraction of groundwater using wells; groundwater is pumped out for drinking water and to irrigate farmland.
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