Answer:
Chemicals used to increase crop growth: fertilizers
Chemicals used to prevent insect infestation of crops: pesticides
Choosing the single most efficient crop variety for the exisiting conditions: monoculture
Planting different crops each year for healthier fields: crop rotation
Explanation:
A push factor is something that _bad __people away.
And push factor is bad things in economic is less money ,in environment is natural disasters,in social is bad rights,war and bad politic.
Can you write this for it had to be good and right! If you don't I'll make another post and you can tell me how many points you want and I'll give them to you and the brainlest :)
Answer: Lol you put this question as a geography question, the answer is 23
Explanation: Have a nice day person. :)