Identify the possible link “A” in the following food chain.

Plants $\to$Insects $\to$ Frog $\to$A

Food chain is a sequence of transfer of energy from one trophic level to its higher trophic level in the form of food. It helps to know how one species is related to another.

• Food chain starts in the following way:

         Primary producers $\to$Primary consumer $\to$Secondary consumer $\to$Tertiary consumer

• Primary producers are green plants, which are eaten up by primary consumers such as insects.
• Primary consumers (insects) are eaten up by secondary consumers such as frogs.
• Secondary consumers (frogs) are eaten up by tertiary consumers such as cobras.
• Parrots and rabbits cannot eat frogs as they are also secondary consumers themselves.

Hence, the food chain will be followed as :

Plants $\to$Insects $\to$Frog $\to$Cobra