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18.6: Ecosystems- Challenge 1

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    1. Abiotic factors in an ecosystem include ___.
    living space, water, and temperature (this list isn't exhaustive)
    2. An organism's "job" within its community is its ___.
    3. What is the relationship between population, community, and ecosystem?
    A population is all the individuals of a particular species living in a given area. A community includes all the different populations of an area. An ecosystem is the biotic and abiotic factors in which the community lives.
    4. A tapeworm living in the stomach of a human is an example of ___.
    5. A plant-pollinator relationship is a ___ relationship.
    6. Lichen is a fungus and an algae living together. The algae provides food through photosynthesis, while the fungi retains the moisture that they both need to live. This relationship is an example of ___.
    7. Food webs are more accurate than food chains because ___.
    many organisms eat at multiple trophic levels
    8. There is a large number of producers in an ecosystem, but there are much fewer ___ at the highest trophic level.
    9. A ___ depicts the feeding connections in an ecosystem.
    food web
    10. Broken down rocks and minerals provide ___ in ecosystems.
    11. Plant cell growth depends on the nutrients ___.
    nitrogen and phosphorus
    12. Substances that enter a food chain at the bottom and leave at the top are ___.
    13. ___ cannot use atmospheric nitrogen, so they depend on bacteria in their root nodules to "fix" nitrogen for them.
    Legumes and other plants
    14. Nitrogen-fixing bacteria convert nitrogen to ___.
    15. Nitrifying bacteria convert ___ to ___.
    ammonium to nitrites

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