Which of the following statements best describe the first tjing researchers need to do to manipulate dna

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

The hardy-weinberg principle is that genetic frequencies in a population? will remain stable from generation to generation will always be changing will not be affected by environmental changes are always in a 3: 1 ratio

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine