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That's definitely a project he needs to research on and do by himself ;]
But just to help, an ecosystem is a biological community of interacting organisms and their physical environment.
1. Look at cold ecosystems like Canada and Russia or Greenland. See how the species interact, and how that influences humans. For example, we wear thick clothing to protect us from the cold and build heated homes. Fishing is affected because it's hard to fish in frozen lakes. However, in these climates, water is abundant.
2. If you look at hot ecosystems, like the desert, men may wear light clothing. We cover our bodies to reduce sunburn and wear tons of sunscreen. Water is scarce in these environments, and dehydration happens quickly. We need to make sure we get plenty to drink, and never eat dry foots like rice and bread. A lot of different animals can survive in heated lands, such as giraffes, meerkats, bores, and certain aquatic animals (Depending on your region, such as the plains of Africa, you can find ponds and lakes.)
3. Lets try rain forests. Now, Rain forests have the greatest readily amount of consumable human food. Tons of animals live in these areas, but also tons of dangerous and pesky ones, too. That's why houses should be elevated, and you should never sleep on the ground. Water can be collected from trees and rivers, while food can be found everywhere. Things like apples, avocados, bananas, and pineapples grow in masses.