What is the largest ecosystem?

I think its d Marine ecosystem

Marine ecosystems consist of oceans, coral reefs and estuaries. Currently oceans are the world's largest ecosystems and are said  to cover the shore as far as tidal waters come in.

Explanation:

Hope it helps :)

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.