The two main sources of oxygen in the sea are photosynthesis and transfer from the atmosphere.
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Q34: Choose the most appropriate statement that matches
Q57: Eutrophication can lead to
A) an algal bloom.
B)
Q58: The process of increasing nutrient levels in
Q59: The primary source of energy for primary
Q60: Estuaries are an example of:
A) niches.
B) populations.
C)
Q61: Decomposers play an important role in the
Q63: The abyssal zone is one of the
Q64: Producers can be photosynthetic or chemosynthetic.
Q65: MATCHING
Match the word with the word it
Q70: MATCHING
Match the word with the word it
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