Grass obtains 10% of the energy of the sun. when a mouse eats the grass, it gets only of the sun's energy while is lost as heat.

Grass only obtains 10% of the energy of the Sun. When a mouse eats the grass, it only gets 1% of the energy of the sun, while the remaining 9% is lost as heat. Remember, an average of 10% of the sun’s energy is transferred, in each link of the food chain. So, the answer would be 1% of the sun energy. 

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons

1. aspect is nothing really because the answer is right in front of your face