How many different bases are associated with the makeup of dna?
3
4
6
5
none of the above

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

Where substance is produced during cellular respiration

What is the process by which biological parents pass traits such as hair type or eye color to their children