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The food web below illustrates the flow of energy through an ecosystem.
"Food Web." Wikipedia. Wikimedia Foundation, 08 Sept. 2011. Web. 19 Apr. 2016.
Which of the following statements is a correct interpretation of the food web?
Nematodes (root feeders) and fungi have the least free energy available to them because they feed off producers.
Birds have the least free energy available to them because they are at the top of this food web, and most of the free energy is consumed at lower trophic levels.
All organisms in the food web have the same amount of free energy available because they all depend on plants for their energy.
Plants have the least free energy available because they are the energy source for the entire food web.