What would happen to the amount of oxygen in earth’s atmosphere if half the trees on earth were cut down? why?

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.

What are levels of ecology and how can we remember them

What determines how quickly blood dries?