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Marine ecosystems include the oceans, estuaries and:
ACoral reefs
BPond waters
CMarsh lands
DPeat bogs
Answer & Solution
Correct answer: A. Coral reefs
1. Freshwater systems include lakes, ponds and bogs.
2. Marine systems include coral reefs.
3. Estuaries are marine too.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 15, Life on the Earth._
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