It is true that dead zones in waterways can occur as the result of fertilizer runoff.
Answer:
theory
Explanation:
a theory results from a proven hypothesis
Answer:
IV: Amount of pesticide
Independent variable is what can be changed
DV: Time of death how long it takes
What you can’t change
Explanation:
Planting the same crop in the same place each year zaps nutrients from the earth and leaves soil weak and unable to support healthy plant growth. Because soil structure and quality is so poor, farmers are forced to use chemical fertilizers to encourage plant growth and fruit production.