It is usually marked by letters. Such as ababbcc. That shows what lines rhyme with other lines. There's also AABB, ABAB (shwing that line a rhymes with line a, then line b rhymes with line b. It goes line a, line be, line a, line b.
~Silver
The correct answer is the Nervous system and the Endocrine system. These two systems control all other systems and by doing it create homeostasis in the body.
The answer is B) Appearance versus reality