5 An introduced/invasive species .

A - can easily be removed from the community later.
B - are never able to establish themselves in the new habitat
C - stabilizes the structure of the native community
D - may disrupt the native community

6 Melting of the permafrost the atmosphere.
A - removes CFCs from
B - releases sulfur dioxide from
C - increases the release of more of the same gases that led to the melting of the permafrost in
D - counteracts the release of greenhouse gases into