The law of universal gravitation states that any two objects in the universe that have mass, without exception,

a. attract each other
b. repeal each other
c. combine to provide a balanced force
d. create friction

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

it is the most commonly accepted one