<span>A substitution is a
type of mutation in which there is an exchange between two bases (for example, switching A for G). Changing a base can lead to a different codon, and consequently, a change in the protein produced. Sometimes, the mutation can be silent, meaning that the substitution didn't change the codon or the protein. However sometimes they may change to a "stop" codon and because of that the protein ends incomplete. If it affects an important protein it can completely change the organism.</span>
Plants take in carbon dioxide from the environment for photosynthesis. Because trees are large, they need a lot of energy, which likely results in a lot of carbon dioxide being removed from the air. If they’re chopped down, there will be fewer trees to remove the extra carbon dioxide from the air.
