Plz help ! Take a look at the following passage from "Found! An Amazon Rainforest Tribe." Choose the two sentences that show how officials can find clues that a tribe might exist without visiting the Amazon rainforest.
Officials in Brazil recently announced that another indigenous tribe has been found. The tribe lives in the Amazon rainforest. The tribe is completely isolated from modern life. The discovery of the community comes from a determined effort by Brazil's government to identify uncontacted tribes and preserve their way of life.
In June 2011, the Brazilian government wrote a press release. It was about the recently identified tribe. The report said that speculation about the group started from satellite pictures. The pictures showed three large clearings in a southwestern area of the Amazon rainforest. Using airplanes to avoid disturbing the group, officials confirmed the tribe's existence. They also gathered additional information. There are about 200 people in the tribe. They live in four large, straw-roofed buildings. The group grows corn, bananas, peanuts, and other crops.
The region where the tribe was found is near the border of Brazil and Peru. It is part of a huge reservation called Vale do Javari. It is nearly the size of Portugal. The reservation is home to about 2,000 people.