The anatomical part of the lungs where oxygen and carbon dioxide are exchanged is the: trachea. alveoli. bronchioles. bronchi.

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

What type of cell is produced after fertilization occurs and the gametes combines ?

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