It is not co-op, but there is an instance where the player can use Steve Burnside as a playable character. But it is not co-op, no.
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You use it in the underwater airport.
Jill valentine comes out in resident evil 1, resident evil 3 and resident evil 5.
It depends on which jewel you need. The first jewel that you obtain is Alfred's Jewel. This is located by his dead body. The 2nd jewel that you obtain is Alexander's Jewel. You can get this when it falls off of Alexander's body. The final jewel you get after you defeat Alexia.
no
As of yet only Resident Evil 5 is available for the XBox 360.