<span>If an island had 1000 cats on it, an ecologist would use the word 'population' to describe all the members of that species</span>
I think it's the simple columnar epithelium.
Structurally
DNA and RNA<span> are nearly identical. As mentioned earlier, however, there are three fundamental </span>differences<span> that account for the very </span>different<span> functions of the </span>two<span> molecules. </span>RNA<span> has a ribose sugar instead of a deoxyribose sugar like </span>DNA.RNA<span> nucleotides have a uracil base instead of thymine.
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p.s (google helped)
