<span>a. the effect of oil spills on marine animals</span>
Answer:not sure if this is what youre looking for but the air is made up of 78.09% nitrogen, 20.95 oxygen, 0.93% argon and 0.04% carbon dioxide
Explanation:
Answer:
Negatives traits, such as diseases, may build up in the population.
Useful traits may be "bred out" of the population.
The population becomes weaker and less resilient.