<span>strip-cropping:cultivation of crops in strips following the contours of the land</span>
I think that its the third one.
Answer:
By understanding how cells function in healthy and diseased states, cell biologists from the medical, animal and plant sciences will be able to develop new vaccines, medicines and more effective plants with improved properties and, through increased knowledge, a better understanding of the way of life of all living things.
Explanation:
The answer is, "Wind, Water, and Animals".