answer them in eng

1. We should protect trees because they are part of our environment and important to our health. They can release oxygen so we can breath the fresh air and good for our lungs, also it can breath in carbon dioxide to make the CO2 cycle balance and help alot in slove the problem of global warming.

2.-endangerous
-food for other animals, if they endangerous and it will affects the food web

3. environment can affect our health and life
environment is destroying and we may can't stay in the earth about million years after bcoz we destroy the environment such as global warming...

! Because tree can produce air.
2 Because animal can help us to eat the insert