I'm sorry, I tried to do this but my junky computer wouldn't let me.... good luck :)
If one trophic levels population increases or decreases too much, it can decrease the amount of producers, this decreasing the amount of energy available in food web which can cause population crash.
Answer:
None of these.
Explanation:
None of these seem right to me. If that is not the answer I would go with an increase of erosion in the soil.
Answer:
Breast, Colorectal and Lung cancers are the most common. Smoking and Tobacco. Diet and Physical Activity. Sun and Other Types of Radiation are the most common causes of cancer.
Explanation:
I think this is what you need, if not could clarify a bit more in the question.
