Reef-building corals have a symbiotic relationship with algal cells called ________ that live within the cells of corals.
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Q8: In lakes and ponds,the _ zone is
Q9: In lakes and ponds,the depth at which
Q10: The zone in the ocean from the
Q11: A relatively _ lake is characterized by
Q12: The water above the continental shelf belongs
Q14: In the benthic zone of lakes and
Q15: Flowing-water ecosystems often alternate two different but
Q16: A(n)_ is a ring of coral reefs
Q17: _ fish are those that live most
Q18: The tiny,photosynthetic,primary producers of open water such
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