Invasive species are nonnative species whose introduction to a new ecosystem represents a threat to the diversity of such ecosystem. Is false to affirm that all nonnative species are considered invasive species. Innocuous nonnative species introduced to ecosystems are not considered invasive species, but rather as introduced species or alien species.
Flemming found that the growth of bacteria Staphylococcus aureus is inhibited by fungus Penicillium notatum . Then he isolated antibiotic penicillin from that .
