Let’s keep things simple two rules.
- No giving sentience, This is a no brainer issue.
- Let’s keep it to beings under the Animilia kingdom. “mutated virus/bacteria” is a common trope.
To start:
Let’s modify ants to have lungs.
Most insects are constrained by the amount of oxygen they can acquire through their exoskeleton.
Imagine how big they can get if they didn’t have that constraint?
Not only that but that the energy from the nutrients generated in a plant is solely used for cell growth and maintenance. Even remotely suggesting a self-warming and extremely kinetic mammal can get energy solely from the sun is nuts.
I also saw a documentary about the ineffectiveness of the photosynthesis Enzyme. Maybe we need to alter this for something like mammal photosynthesis.