<span> DNA sickle hemoglobin is a result of a point mutaion in one base rna changes from gag to gug protein amino acid level changes amino acid from glu to val. </span>
67 million years ago in the form of phyollths (small sllica flecks in grass that make it difficult to digest)
Physical chemists study matter and energy, and there is chemical reactions in your body, and all living things have elements, like carbon.
I would say D
