PLEASE HELP :( Match the vocabulary from this section with its example.

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

During convection, less dense fluid rises and denser fluid sinks.

Three applications for admission to a local university are checked, and it is determined whether each applicant is male or female. the number of sample points in this experiment is