In the context of food chains and energy transfer, the terms you are looking for are likely "food webs" and "pyramid of energy."
Thus, the completed sentences would be:
"Food webs are another way of showing how food chains show how energy is transferred through organisms. The largest part of the pyramid of energy is where most of the sun’s energy is stored and plants are located in this point."
If you need more specific information or further assistance, please let me know!