enough to keep them alive.
To keep all kinds of working humans alive.
Trees help to keep our planet alive by converting carbon dioxide into oxygen which is necessary for humans and animals to live.
To keep them alive pretty much the same as humans
to maintain our enviroment and to keep humans alive
your body needs energy and fat to keep yourself alive
They are VERY useful to humans. So, we keep them alive! Mustangs survive on their own, too. They are bright, amazing creatures.
Animals and humans eat food to stay alive. Metabolic processes break down the food (plants and animals) to obtain energy, and the materials needed to build and repair the body.
To keep them alive, as poison gas affects dogs in the same way as humans.
Because just like us they are living, breathing animals. That's like saying why sould we try to keep humans alive. Just like the manatee we can't go extinct. Because then their would be none of us left. That's why we need to keep manatees alive.. ? ;)
the dead cells in the soil help the plants grow and plants give you oxygen which humans need
because if we didnt have them we would all die, because the brain and heart are what keep you alive and they are organisms