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An energy pyramid is shown below.

Within ecosystems, energy generally flows from
A.
primary consumers to producers.
B.
secondary consumers to primary consumers.
C.
primary consumers to secondary consumers.
D.
all of these

An eco-system is a set of living and non living organisms living in a certain area where they interact with each other to fulfill their life requirements. One of the every important component of any eco-system is food chain.

What is food chain?

Food chain is a series of events which involves the living organisms and the process of obtaining their food and nutrition from one organism to another.
A food chain starts when the autotrophs or producers or plants produce their food through the process of photosynthesis.
The next organism of food chain are primary consumers that eat plant based foods. These are called herbivores. For example: rabbit
The next sequence organism of food chain are secondary consumers that eat primary consumers. These are called secondary consumers. For example: snakes that eat rabbit.
The next sequence organism of food chain are Tertiary consumers that eat secondary consumers. For example owl which eats snakes.

So based on above information we can say that flow of energy in an eco system is as:

Sun --> Producers --> primary consumers --> secondary consumers -->Tertiary consumers

Therefore, only option C is correct.

Hope it help!