T or F Biology Questions

In commensalism, one species benefits and the other neither benefits nor is harmed. T of F?
The rigid, outer layer of Earth is referred to as the asthenosphere. T of F

Increases in greenhouse gases cause increases in global temperature because these gases are able to trap heat reradiated from Earth's surface. T or F

Thanks!

True: http://en.wikipedia.org/wiki/Commensalis…
I want to say false for this one? http://en.wikipedia.org/wiki/Asthenosphe…
True because the gases cannot escape and they are heated up by the sun

T, T, T....

T,F,T.

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