In the carbon cycle,the source of carbon for plants is:

Assertion $(A):$ $A$ natural ecosystem is usually self-sustainable.
Reason $(R):$ An ecosystem having producers,decomposers,and a source of energy is self-sustainable. Select the correct answer from the options given below:

Identify the mismatched event from the following structures.

Which of the following exhibits scavenging?

In an aquatic ecosystem,at which trophic level do detritivores belong?

Find an incorrect statement for $DFC$ (Detritus Food Chain).