WILL MARK BRAINLIEST! GIVE THANKS + RATE. PLEASE ANSWER!
Energy is conserved. That is, it can never be created or destroyed. However, every time a conversion of energy occurs, some is transferred to a form that is not usable. This transferred energy is in the form of .
A.
chemical bonds
B.
electrical force
C.
light
D.
heat

(D Heat) is the answer because  There are three methods of energy transfer that we need to learn: conduction, convection, and radiation. 1. Conduction: Heat is thermal energy, and in solids it can be transferred by conduction. Heat is passed along from the hotter end of an object to the cold end by the particles in the solid vibrating.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.