Why did scientists initially think it was unlikely that a bacterium caused peptic ulcers?

The deserts of the sahara and australia are associated with

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Select all that apply. why are common names not a good reference to a species? common names can be in different languages common names vary with location common names vary with culture common names vary with species color