1. The least amount of energy is available at the ______________ level of an energy pyramid.

2. Approximately what percentage of the energy in the plants is passed on to the animals that eat them?

3. What do producers release as a result of photosynthesis?

A. Carbon dioxide C. HydrogenB. Oxygen D. Nitrogen

Use the list of organisms provided for each food chain and place these organisms in order according to the flow of energy. Remember to begin with energy coming to Earth. The path should go from the original source to the last organism to use the energy

Hawk Bunny Rabbit Sun Lettuce

Sun Lettuce Bunny Rabbit Hawk

Snake Cricket Rat Seed Sun Eagle

Sun seed cricket rat snake Eagle

Cod Algae Sun Krill Leopard Seal Killer Whale

Sun algae krill Cod Leopard Seal Killer whale

Shrubs Sun Mountain Lion Deer

Sun Shrubs Deer Mountain Lion

Sun Herbivore Carnivore Producer Top Carnivore

Sun Producer Herbivore Carnivore Top Carnivore

Create wetlands Install nesting boxes that increase the

number and range of wood ducks Acid rain, damages amphibian eggs Clear cutting forests reduces squirrel or

owl populations Suburban sprawl reduces mule deer

winter range decreasing numbers of deer

1955 used DDT to kill mosquitoes that carry malaria

Thatched roofs collapsed because the DDT also killed the wasps that ate thatch-eating caterpillars

DDT also killed cockroaches which lizards then ate and damaged the lizard’ nervous system making them slow.

Cats ate the slow lizards Cats died from DDT affects

Rats from the forest moved in

Rats carried fleas that carried the plague

Had to parachute in healthy cats to control the rats

Make a food web for the organisms on Borneo

No longer any reproducing organism of a species on Earth

Examples Dodo bird Passenger pigeon

Taking organisms out of the ecosystem is like taking bricks out of a wall; too many and it will collapse.