How much energy is lost between levels of a food pyramid?

Why are there usually only 4 or 5 links in a food chain?

Living things that convert the sun's energy into chemical energy for other organisms are called:

Which one of the following ecological roles is the most numerous in an ecosystem?

What is an environment's carrying capacity?

What is the role of bacteria in the nitrogen cycle?

Burning of fossil fuels has led to...

Abiotic factors include:

Biotic factors are defined as:

Examples of biotic factors include...

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