Question

3. What will happen if there are no trees?​

Answer 1

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Without trees, humans would not be able survive because the air would be unsuitable for breathing. If anything, people would have to develop gas masks that filter the little oxygen that would be left in the air.

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Answer 2

$\implies$Life could not exist on Earth without trees because they produce most of the oxygen that humans and wildlife breathe.

$\implies$Trees also help prevent topsoil erosion because they break the force of wind and rain on soil, their roots bind the soil, and their decayed, falling leaves are absorbed by the earth and enrich the soil.