Answer:
If I am correct it is when the weaker individuals or mutated individuals are killed of by other predators or by nature. Because they cannot survive this is natural selection because they are killed of by nature. Then if they are weak their species will go extinct, thus they are naturally selected to die and only the strong species remain.
The 8 characterstics of life are as follows:
1. Made of cells
2. Adapt and Respond to environment
3. Homeostasis or Internal Balance
4. Based on genetic code- DNA or RNA
5. Evolution- all organisms evolve over time
6. Consume energy
7. All organisms reproduce
8. All organisms grow and develop
Isocitrate + NAD+ -> a-ketoglutarate + CO2 + H2
The amount of ATP produced from one molecule of glucose will decrease because NADH is no longer produced in the isocitrate dehydrogenase reaction. Without generation of this high energy electron carrier there will be less electrons from one molecule of glucose that are transferred to and through the electron transport chain. So there will be less protons (H+ ions) pumped into the intermembrane space. So there will be less of a H+ ion gradient across the inner mitochondrial membrane to drive the synthesis of ATP by ATP synthase.
I believe it is C, but i cant be sure
I hope i helped a little :)