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Secondary consumers are also known as ________ consumers.

Detrivores and _______ feed on dead organisms.

Nitrogen in the air can be removed by...

Nitrates can be broken down into nitrogen by bacteria in the soil in a process called...

Data can be obtained by...

Life on earth began about_______ ___________ years ago.

The very first living things developed from...

___________ __________ created the theory of evolution.

The slow, continual change over many generations is called...

The main cause of extinction is...