The_ans:_water,_and_oxygen.
3/4 in my biology class we just got done with that unit so i hope this helps
Here are a few disadvantages of modern farming
The excessive use of chemicals by the help of machines reduces the fertility of the land.
Lack of practical knowledge the farmers cant handle the machines properly.
While the cost of maintenance is very high.
Answer: A) Genetic diversity
Well go ahead and do that project. You got work to do