An ecosystem is a system formed by the interaction of a community of organisms with their environment. so its pretty much a food chain and the environment it is in.
Animals find shelter in the ecosystem. The animals are predators. They use the resources they have.
There is only one ecosystem the comprise with animals. The only ecosystem that comprises animal is nitrogen.
=Ecosystem is the habitat the animal lives in and the enviroment is the surroundings of where the animals live in....==Ecosystem is the habitat the animal lives in and the enviroment is the surroundings of where the animals live in....==Ecosystem is the habitat the animal lives in and the enviroment is the surroundings of where the animals live in....=
live there
An animals habitat
An animals habitat
A water ecosystem is a ecosystem that has water and water animals.
An ecosystem is a place where plants and animals ( maybe humans ) live and animals and plants live in the desert so … 
Because it is to their ecosystem that animals (plants and other organisms too) have adapted through evolution.
Animals and insects are part of the ecosystem. This is an example of a sentence that uses the word "ecosystem."
snails
because as such animals are in the ecosystem on this planet is called earth