The degree of skin pigmentation, body size, relative fragility or robustness, and other physical characteristics may affect one's survival in a number of different environments.
(The degree of skin pigmentation, body size, relative fragility or robustness, and other physical characteristics; may affect; one's survival in a number of different environments)
The degree of skin pigmentation, body size, relative fragility or robustness, and other physical characteristics
may affect
one's survival in a number of different environments