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Science Review for Ryan

Across
An organism that makes its own food.
An animal that breaks down dead organisms so that new plants can grow.
Human waste that is carried away from buildings through a system of pipes.
A water treatment plant is called a ____________.
______ is a kind of living organism: yeasts, moulds and mushrooms are types of________.
__________ 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 eats other animals to survive.
An animal that feeds on dead organisms.
Animals that can't make their own food so they eat plants or other animals.
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 ____________..
Down
An animal that is hunted and killed by another for food.
Special decomposers used in composting.
A ______ is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.
Animals that hunt, or prey on, other animals.
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.
An animal that feeds on both plants and animals.
A colourless, oderless and tasteless gas used as fuel to provide energy for homes and industries. Rotting vegetable can produce ______________.