option 2 seems appropriate for me!
Answer:
Humans would lose a large part of their diet. Insects would would increase a lot. We would lose all products produced from bird parts.
Explanation:
The correct answer is The effect of oil spills on marine animals.
Environmental scientists deals with the study of nature and the interaction of nature with other organisms. Any effect on environment caused by any means is studied by environmental scientist.The effect of oil spills is harmful on marine animals and this is known to us because it was studied by the environmental scientists. This is also apart of environmental science.