At some point all chordates get a flexible rod in there back called

An enzyme lowers the energy of activation. what does that mean?

What element does susan b. anthony include in this passage to strengthen her argument?

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