Answer:B, an introduced species is not necessarily harmful to the environment, an invasive species has a negative effect
Explanation:
Answer:
why was the discovery of pencillin important?
Penicillin discovery came as a result of the plague that rages St Mary's hospital in 1928, the discovery by a man called Alexandra Fleming which drastically reduce the death rate. Penicillin is an antibiotics that is gotten from mould and it has different strains/species
Explanation:
It is between A and B.
But if the species is going to be extinct, that means that they are being threatened.
So the answer is B.
Dogs breed in the world and even more mixes and mutts than we can count
