Which feature do prokaryotic and eukaryotic cells share?

They have multiple features in common. They share basic cell features such as cell membranes and molecules, such as proteins, lipids, and even carbohydrates.

All cells have a plasma membrane, ribosomes, cytoplasm, and DNA. Prokaryotic cells lack a nucleus and membrane-bound structures. Eukaryotic cells have a nucleus and membrane-bound structures called organelles.

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.