Answer:
basically gas exchange happens in alveoli where Oxygen enters in RBC and co2 is released where oxygenated and deoxygenated bloods get seperated
I believe the answer would be B
Are their any answers choices to pick from
DNA is an example of a complex biological polymer called a nuclei acid. Nucleic acids are made up of many smaller sub units called nucleotides. The components of a DNA nucleotide are deoxyribose, phosphate group, nitrogen group. There are four possible bases in a DNA molecules which includes adenine, cytosine, guanine and tymine.
