False because a chemical reaction come from probably a plant or the tree because of its chemicals it has releasing the chemicals in the air to help us breathe so false. Hope this helps
DNA is present in all human cells, except the red blood cells, that is because <span>RBCs do not contain the organelle nucleus or any other DNA containing organelle.</span>
During sexual reproduction, the genetic material of two individuals is combined to produce genetically-diverse offspring that differ from their parents. The fact that most eukaryotes reproduce sexually is evidence of its evolutionary success. In many animals, it is actually the only mode of reproduction.