Freshwater has very low salt content or does not contain salt. Only ____ of aquatic ecosystems is considered freshwater.

The open-water zone away from the shore is called

The topmost or the shallow-water zone, called _______, is nearest to the shore.

The bottom part below the open water zone is the

The marine ecosystem is also called

This is where the ocean meets the land.

An ______ is a place where freshwater meets saltwater.

Estuaries are often called " Nurseries of the _____" because they provide essential nesting and feeding habitats to aquatic plants and animals,.

Estuaries have a lot of biodiversities. They serve as feeding sites and breeding grounds for animals that live in deep waters.

Estuaries are important for recreational areas. Tourists go to estuaries to watch birds, to ride a boat, or to swim.

The ________ zone, also known as the midnight zone, receives little to no sunlight. That is why producers, like aquatic plants, do not live here.

Wetlands have a rich diversity of plant and animal life. Organisms found in wetlands are adapted to moist and humid conditions.

Lakes and ponds are divided into three zones determined by depth and distance from the shore.

Very deep lakes have an area known as ________zone, where light is limited or is not present at all.

Aquatic ecosystems should be protected and conserved.

Freshwater ecosystems include ponds and lakes that have still water, and rivers and streams that have flowing water.

Wetlands are saltwater ecosystems found in areas between land and water, where water is completely or partially shallow.

Saltwater ecosystems also called marine ecosystems, include the oceans and seas.

Water covers 85% of the Earth's surface.

In an estuary food web, the sun's energy is converted into food energy by producers such as plants, algae, and plankton.