<span>A six-carbon sugar is an example of a molecule </span><span>that can join with other molecules to form a carbohydrate such as starch or cellulose.</span>
Variations in evolution usually refers to variation of genes at a particular loci. This differs from diversity which is the total of genetic differences within a population. Speciation is the reproductive isolation of a subset of a population.
Human activities such as Smog and Greenhouse gas can weaken the Earth's atmosphere allowing the suns rays to be more powerful when passing through the Atmosphere.
