An internal conflict features character vs

a. character
b. nature
c. self
d. society

The answer is C: self. A conflict involves a struggle. In the case of an internal conflict one character is  experiencing a struggle between two desires or emotions, it's a psychological conflict, a fight inside between good and evil, virtue and vice. All this causes a lack of action and a mental agony. A external conflict involves another character, society and nature.

the sample answer on e2020

conflicting values are demonstrated between two different groups in animal farm. first, the farm animals value hard work. this is shown by them working late and working long hours at the request of the pigs. napoleon and the pigs, however, sleep late daily. furthermore, the animals value equality. this differs from the value of napoleon and the other pigs. instead of equality, they value only gaining power and maintaining their own privilege, which is demonstrated by their taking extra milk and sleeping in beds.

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.