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Science Vocabulary Review

Across
In any ecosystem there are many food chains and, generally, most plants and animals are part of several chains. When you draw all the chains together you end up with a ____________..
An animal that feeds on both plants and animals.
Animals that hunt, or prey on, other animals.
Human waste that is carried away from buildings through a system of pipes.
Animals that can't make their own food so they eat plants or other animals.
__________ are microscopic single-celled organisms that thrive in diverse environments. They can live within soil, in the ocean and inside the human gut.
An animal that breaks down dead organisms so that new plants can grow.
A colourless, oderless and tasteless gas used as fuel to provide energy for homes and industries. Rotting vegetable can produce ______________.
A water treatment plant is called a ____________.
A large tank in a sewage treatment plant where microorganisms break down solid waste.
An animal that only needs to feed on plants to survive.
Down
______ is a kind of living organism: yeasts, moulds and mushrooms are types of________.
An animal that eats other animals to survive.
A ______ is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.
An organism that makes its own food.
An animal that feeds on dead organisms.
Special decomposers used in composting.
An animal that is hunted and killed by another for food.