Two teams studied two types of animals: team A studied predators, while team B studied grazers. They learned a lot from this experience. Which team learned that predators play an important role in an ecosystem?
Ans: team A

Two coffee farms used different methods to grow coffee. Hill farm grown coffee conventionally, while Valley farm is into shade-grown coffee production. Which farm grew less coffee with improved quality?
Ans: Hill

Two farms were situated on opposite banks of a large river flowing into the ocean. Hill farm practiced conventional agriculture, while Dew farm practiced permaculture design within the context of organic farming. Which farm generated more marine pollution?
Ans: Hill

Mark is doing an experiment creating a magnet. He takes a piece of iron named iron bar A and wraps it in a coil of copper wire. After that he puts an electric current through the copper for about an hour. Given Mark disconnects and unwraps the copper wire, will the magnetic strength of the iron bar have increased or decreased?
Ans: increased