List ways that natural selection, genetic variants, and environmental factors contribute to evolution

Draw the structure of dna nucleotide with adenine as nitrogenous base

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

How does the carbon cycle involve an exchange of carbon