Which of these is not a characteristic of all living things? A. They require an energy source.

B. They are made up of more than one cell.

C. They maintain stable internal conditions.

D. They respond to changes in the environment.

I feel like it could be C because not all living things could maintain stable internal conditions because maybe there could be health issues in your family tree or how cat are breeded together to make a new cat. That cat could have some serious health problems that might not be fixable