Can you please show me an exaple of the arrow head pointing on a food chain?
Sure! Here is an example of a simple food chain with arrowheads pointing from the prey to the predator:
Grass (producer) --> Rabbit (herbivore) --> Fox (carnivore)
In this example, the grass is the producer, the rabbit is the herbivore, and the fox is the carnivore. The arrowheads indicate the flow of energy and represent the direction in which the energy is transferred from one organism to another in the food chain.