All of it
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yes sandy soil would (:
to make new animals or to keep a certain species alive.
animals need water to keep them hydrated, healthy and alive.
to keep them alive hehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehe
yes, animals such as fish store fats to keep them warm and alive during the cold winter, so eating fish would keep kids lean.
Well to keep the species alive obviously, If they did not the animal would become extinct. We are animals and when someone does have sex it is generally when they love each other and want to have a family.
Oxygen.
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.. ? ;)
Trees help to keep our planet alive by converting carbon dioxide into oxygen which is necessary for humans and animals to live.
A saltwater crocodile would not survive in fresh water. Salt water animals need the salt to keep them alive and to nourish them.
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.