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Earth Science c/o marine/water ecosystems

1.  which of the following factors which help shape marine ecosystems?
a.  salinity of the water
b.  temperture of the water
c.  the amount of oxygen dissolved in the water
d.  all of these
2.  where do you find the greatest abundance of flora and fauna in saltwater biomes?
a.  supratidal zone
b.  interidal zone
c. neritic zone
d.  none of these
3.  water is most dence when it is ice
 true or false
4.  the water in a river is warmest at its headwaters
5.  the spring and fall overturns in lakes occurs as dense cold water sinks and displaces warmer water
true or false
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