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There are 3 things that can be harmful if it reduces the organisms for survival and reproduction. The three things are changes in DNA, changes in phenotype and mutation .
Reproduction.
Reproduction
Camouflage and protective coloring adaptations improve an organism's chances of survival and reproduction.
Reproduction is different from other life functions in that it is not necessary for the survival of a single person but is necessary for the survival of a species. Reproduction also generally involves two people or organisms.
The less of a chance of survival there is, the less organisms will survive to sexual maturity (when they are able to reproduce)
Reproduction
Natural selection
Survival and reproduction is the perpetuation of the species.
Dissolved gasses, light intensity, pH level, and water availibility.
Like all living things, nutrients are required for survival. (Survival is the prime directive, and after that reproduction is next on the "to do" list, for all living things.)
Survival and reproduction. Survival is the race and reproduction is the win at the finish line.