What is the largest ecosystem on the planet? a).grassland b).tundra. c).ocean. d).desert.

The largest ecosystem on the planet is the ocean system. The correct option in regards to the given question is option "C". It is a known fact that our earth is covered with 70% water and 30% land. On top of that the marine environment covers about 97%. This is the largest ecosystem on our planet. It is a known fact that our earth is covered with 70% water and 30% land. On top of that the marine environment covers about 97%. This is the largest ecosystem on our planet. The marine world supports a huge amount of life form and there is also the opinion that the first life could have evolved from this system.

The answer is C) ocean 
The marine ecosystem is the largest ecosystem after the whole of planet Earth because water accounts for more than 70% of Earth`s surface. the marine environment ( our oceans and seas) account for more than 97% of that ! 
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A. radioactive dating