Why is carbon so abundant to living things when oxygen is to the earth

What should be the strand of complementary dna produced by the strand of dna shown below cgt ata

Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down

If you want to double a batch of brownies you must have double the ingredients before you start cooking similarity a cell must double its contents including its dna prior to dividing