There are many kinds (can't name them all off the top of my head)
1. Telling someone you'll keep it a secret and then tell anyway...
2. Always being there for someone and then not
3. When you cheat on your husband/wife or someone you're in a relationship with
4. Using someone just to get some
Those are all I can think of (at the moment). But you can just pick whichever one you want.
Answer:
Because a C atom can form as many as 4 other atoms
Explanation:
Debido a que un átomo de C puede formar enlaces covalentes con hasta otros cuatro átomos, es muy adecuado para formar el esqueleto básico o la columna vertebral de una macromolécula.
