What is the biological definition for survival? What does an organism need to survive?
Survival is just living rather than dying. There's no special biological definition.
What is needed to live? It depends on the organism. Too much carbon dioxide will kill a human being, but plants need carbon dioxide.
This thread has some thoughts on what is required for survival.
I suppose you could distinguish between the survival of an individual vs. a species...or even for a single gene. My handy dandy biology dictionary has this to offer...
Separate names with a comma.