Ecological scientists study organism-environment interactions ... Early life arose in aquatic ecosystems, and all living cells still require water to function. Water availability is influenced ...

Coral reefs are underwater ecosystems that form in tropical waters. Corals are made up of tiny living organisms called coral polyps, which attach themselves to the sea floor. When polyps die ...

These include cleansing the water (wetlands and marshes ... Biodiversity also includes the richness of species of living organisms on earth. The environment is the surroundings of an organism ...