The atmosphere of mars and venus are mostly carbon dioxide earths atmosphere contains only a fraction of a percent of carbon dioxide why is earths atmosphere so different from mars and venus

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

voluntary muscles are controlled by the cerebellum.