Energy transfers upward but is ______________ with each transfer.

Food chains represent many food webs combined.

A source food web represents populations and their

A sink food web represents populations and all of their

A paleoecological web is

The foundation building block for all living things is

Cellular respiration is

Photosynthesis is

Organisms need nitrogen, but they can't use it in the form found in the atmosphere.

While energy decreases as it moves up the food chain, toxins also decrease in potency.

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