Answer:
Oxygen
Explanation
Cellular respiration means taking Oxygen and using it to "breathe" and also be used in many other processes.
What figure below? Imma need to see that figure below that shows how enzymes work.
According to an answer from another and a bit of my own research;
A decomposer is exactly what it sounds like, an organism that decomposes something and feeds off of it. You can eliminate the answers "Owl" and "Hawk" from a first glance as they are both consumers. Looking at it again, an "Ant" is <em>not </em>a decomposer, but rather, a consumer just like your other two options. This leaves "Fungus", something that decomposes it's food.
Please forgive me if I'm wrong. Feel free to ask for more information and I will scour the internet to see what I can find. <3
<u>[bloominginthedark/bloom]</u>