I’m pretty sure it’s water, oxygen, and food. beacuse food provided both nutrients and an energy source.
I believe its A. I could be incorrect though.
It is the circulatory system and respiratory system.
I think it’s C but I’m not fully sure so wait for others just to make sure
There are 4 nitrogenous bases in DNA. Adenine pairs with thymine, and Guanine pairs with cytosine. A Dna Nucleotide consists of a 5 carbon sugar, a phosphate group and a nitrogenous base. These bases are paired up by weak hydrogen bonds, so when they have have to replicate, the enzyme helicase can easily unzip the Dna. <span />
