In any habitat, a keystone species is one that has a major impact on that ecosystem. If that creature were removed, the changes would be nearly immediate and extremely noticeable. Both predators and prey can be keystone species, and are key to maintaining ecological balance.
:333
Answer:
To survive
Explanation:
Without water, we wouldn't have organisms such as fish. We also need it to break down food molecules or generate energy during the respiration process.
Photosynthesis
The plant takes in Carbon Monoxide and releases oxegen.
