What are two basic differences between dna and rna?

The differences between DNA and RNA are.

* Sugar: DNA has deoxyriboses and RNA has riboses.

* DNA is mostly found in double strand, whereas aRN is mostly found in single strand.

There are other differences,

* Both have adenine, guanine and cytosine, but DNA has thymine and RNA possesses uracyl

* size, DNA is usually longer than RNA.

* DNA is found only in the nucleus, RNA is found in the nucleus and cytoplasm.

the correct answer is:

a population changes in response to a change in the environment.