Answer:
sophisticated irrigation, chemical fertilizers, chemical pesticides
Explanation:
The use of irrigation to provide needed water and the use of natural fertilizers to promote crop growth are farming methods that have been practiced for centuries. More sophisticated irrigation techniques, various chemical pesticides, and modern chemical fertilizers have been developed in the twentieth century.
Because they are not made up of monomers.
Yes you can choke on just about anything even air
The fish would die out for the reason of there is no source of food.
As animals move up in the food chain they start to have larger competition for food with other animals, deer compete with elk and even rodents that eat the same food as them. They must fight for food and survival.