oceans cover ___% of Earth's surface

This organism is considered the most important organism on Earth

Plankton make their own food, therefore, they are considered ___________

coral reefs are found in

the ecosystem found near the shore is called the

animals in the intertidal area must be able to suvive

the area where the river meets the sea is called

Many tributaries come together to form a

Water in ponds and lakes is

The main food producer in freshwater ecosystems are

When two or more streams come together they form a

wetlands are important for

the study of living organisms is called

which of these is an example of a biotic factor in an ecosystem

the primary source of energy in nearly all ecosystems is

ALL organisms depend on _________ to survive

The natural environment where a living thing gets all of their basic life requirements is called a

Which of these is not an examples of a freshwater source?

which of these is not one of the four major abiotic factors?

The worlds smallest animals is

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