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In a food web, the arrows represent ____.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
A squirrel lives in an oak tree. The squirrel is provided food and shelter while the tree is not harmed. This is an example of ___.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
There are less numbers of organisms on each level as you move up an energy pyramid because___.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
Sea anemones ride on the shells of hermit crabs. The anemones fend off octopuses, which eat crabs. The crabs drive away starfish and other anemone predators.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
Different species of birds build nests in the same type of trees. This is an example of __.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
The tapeworm lives in the intestines of the dog, obtaining nutrients that normally would have been used by the dog.
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
If there is a drought which kills most of the producers in an ecosystem, which of the following is true?
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
Why are decomposers important to the consumers in an ecosystem?
mutualism
energy transfer
Decomposers recycle nutrients needed by the producers.
parasitism (parasite-host)
commensalism
All organisms in the ecosystem will decrease in number.
competition
only 10% of the energy from the previous level is available for them to use.
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