to other organisms and their environment as regards the nature of the locality they frequent, the temperatures and the ______ of light which suit them, and their relations to other organisms as enemies, rivals, or accidental and involuntary benefactors.

to other organisms and their environment as regards the nature of the

1.	to other organisms and their environment as regards the nature of the locality they frequent, the temperatures and the ______ of light which suit them, and their relations to other organisms as enemies, rivals, or accidental and involuntary benefactors.
A.	amount
B.	focus
C.	share
D.	quality
Answer» B. focus