What are some features of an ecosystem?

Which of the following is a testable hypotheses?

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.

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.