WONDER #2043: How Can You Breathe Where Trees Don’t Grow?

Question 1 of 3

The point beyond which trees can’t survive is known as the what?

1. border
2. arcticore
3. treeline
4. desert

Question 2 of 3

Oxygen makes up about what percentage of Earth’s atmosphere?

1. 5%
2. 15%
3. 21%
4. 47%

Question 3 of 3

In addition to trees, what is responsible for producing a large percentage of Earth’s oxygen?

1. cows
2. solar panels
3. windmills
4. phytoplankton

Check your answers online at https://wonderopolis.org/wonder/how-can-you-breathe-where-trees-dont-grow.