Trees give off oxygen, which is key for our human and animal survival. We breath in oxygen, so that is useful to us. We exhale carbon dioxide which the trees 'inhale'. Trees help rid our earth of harmful pollutants through natural processes.
Trees take in carbon dioxide witch we breath out.... The trees release oxygen's witch we breathe and act like air filter's and clean out the carbon dioxide
They give us air to breathe and wood is used for many different things pencils paper