52. Ecosystems

Which trophic level typically has the most biomass in an ecosystem?

Which of the following best describes how energy is transferred in a food web?

What happens to most of the energy as it moves throughout a food web?

How does energy first enter a pond ecosystem?

In an ecosystem, energy _____, whereas chemical elements _____.

What percentage of energy is typically transferred from one trophic level to the next higher trophic level in an ecosystem?

Which of the following organisms is found at trophic level 1 in an ecosystem?

What is the term for each step in the transfer of energy and matter within a food web?

On a global scale, energy _____ ecosystems whereas chemical elements _____ ecosystems.

In an energy pyramid, which trophic level contains the greatest amount of available energy?

What percentage of energy from a lower trophic level is typically transferred to the next higher trophic level in an ecosystem?

In an energy pyramid representing a terrestrial ecosystem, which trophic level contains the most energy?

Why are there seldom food chains with more than four trophic levels in an ecosystem?

Energy in most ecosystems must flow through autotrophs because ______.