The statement that best describes a human influence on the biogeochemical cycles is A) increased eutrophication caused by high levels of nitrogen and phosphorous.
All eukaryotic cells have within them a variety of different structures called organelles. Organelles are small and function much like organs function in a large organism. Some organelles are responsible for gathering cell energy, others for controlling cell activities. Plant cells have different organelles than animal cells but also share many also. They all have a large variety of sizes and functions and make life as we know if possible. Click the links in the yellow boxes for more detailed information on each of the organelles. Some links may not be active yet - I'm still writing the site and some of the pages may not be up yet
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Adult sponges are sessile. This means they are unable to move from place to place.
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1, if you know that a rock was deposited after the one you are attempting age then you know that the "deeper" one is older.
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Answer: A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.
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