The short answer: incredibly diverse! Not only can ecosystems vary in size, but they can also differ in just about every imaginable biotic or abiotic feature.
Some ecosystems are marine, others freshwater, and others yet terrestrial—land based. Ocean ecosystems are most common on Earth, as oceans and the living organisms they contain cover 75% of the Earth’s surface. Freshwater ecosystems are the rarest, covering only 1.8% of the Earth’s surface. Terrestrial, land, ecosystems cover the remainder of Earth.
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