What are three different types of ecosystems?

There are three main types of ecosystems on Earth. There are freshwater, oceanic, and terrestrial ecosystems.

The freshwater ecosystems take up only a small percentage of Earth's area, but can be seen in many places. Most rivers, lakes, reservoirs, and aquifers around the world are freshwater. They are home to many different species of animals including fish and amphibians. Several species of plants also grow by sources of freshwater, so this ecosystem provides much sustenance and shelter to all living things.

The oceanic ecosystems take up most of the Earth's surface and can be divided up into smaller ecosystems based on the depths of the water. Much of the Earth's photosynthetic plants live in the ocean and most of the known species of water-dwelling animals also live in the ocean.

There are seven terrestrial ecosystems and they give life to all the animals on land. The ecosystems are tropical rain forests, savannas, deserts, temperate grasslands, deciduous forests, coniferous forests, and tundras (this can be grouped into four groups which would be forests, grasslands, deserts, and arctic/alpine). Each ecosystem contains a unique set of living species in unique living conditions.