Because energy cannot be created nor destroyed, organisms either utilize energy to do work, or release energy with each individual chemical reaction. Relative order is the predictable, usable energy and entropy is the scattered, unpredictable energy that is released as heat. Photosynthetic organisms are able to transform energy from the sunlight into usable energy for the cell; however animal cells, in organisms such as the barracuda, do not have the inherent ability to create energy through sunlight, so the consumption of food is necessary.
Barracuda, a eukaryotic, multicellular organism, as a whole requires exponentially more energy than a single celled prokaryotic bacteria; therefore, over a long period of time, releases significantly more entropy into the outside world. The effect of entropy, although almost negligible over a short period of time, will likely be environmentally evident in the long run. If every living thing releases heat at some varying degree (vast difference between heat released from eukaryote vs. prokaryote), logically, this heat should build up over time. The usage of photosynthetic energy in bacteria opposes the consumption of proteins and fats by that of the barracuda. Because the barracuda consumes hardier, more carbon saturated food, the barracuda logically releases more energy, because more energy is brought into each cell.
In conclusion, I believe barracudas, due to their bodies being composed of more cells, the way in which they intake energy, and the amount of food they consume produce exponentially more entropy than photosynthetic bacteria.
Sources:
https://photosynthesiseducation.com/photosynthesis-in-bacteria/
(Also referenced the assignment sheet that provided a background on entropy and relative order)
(Asked Annabel about format and nature of photosynthetic bacteria; however, I did not use any of her words or ideas as my own)
Tessa AP Bio 