Match the items on the right to the items on the left.

Freshwater	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
Marine	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
Desert	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
Forest	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
Grassland	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.
Tundra	??? There are relatively few large mammals in deserts because most are not capable of storing sufficient water and withstanding the heat. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Characterized as lands dominated by grasses rather than large shrubs or trees. The largest of all the ecosystems, oceans are very large bodies of water that dominate the Earth's surface. Precipitation is evenly distributed throughout the year, with annual rainfall exceeding 2000 mm. The vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks.