how does an energy pyramid help to describe energy flow in a food web
An energy pyramid portrays the flow of energy by displaying the plants at the bottom, who get the most energy from the sun, and then gradually moving up to herbivores as it shows the transferal of energy from the plants to the herbivores and how the amount of energy received is significantly less than the original amount. The pyramid then shows how energy is passed from carnivore to carnivore and decreases in amount each time.
The pyramid gets smaller as you reach the top of the food chain because not as much energy can be acquired by eating an animal that has eaten another animal that has eaten a plant that received energy from the sun. The energy decreases as it is passed from one creature to the next and the pyramid depicts this as it gets smaller toward the top.