Please answer all questions

1		Habitat loss has occurred in all ecosystems and is a major factor in causing extinction.
			A)	True
			B)	False
2		Ecosystems around the globe are characterized by unique assemblages of organisms that have evolved together in one location.
			A)	True
			B)	False
3		Introduction of alien species usually means a beneficial contribution to local food webs.
			A)	True
			B)	False
4		Islands are not particularly susceptible to introduction of alien species.
			A)	True
			B)	False
5		Global warming is expected to lead to extinctions, but so far, an increase in greenhouse gases has not occurred.
			A)	True
			B)	False
6		Overfishing for a food species, such as tuna, is an example of overexploitation.
			A)	True
			B)	False
7		One major goal of restoration ecology is sustainable development.
			A)	True
			B)	False