Why do humans have good memory

Because, we just do.

It's natural for us to have good memory.

Because, if we didn't have no good memory... we might have be a s.tupid zombies...

Also, by the way... 60-80 that mean we start to lose memory.

did you mean: energy is defined ashyperactivitya caloric measurementthe ability to move matterthe ability to think and analyze this form of energy is called "energy in motion" or "energy of moving matter"potential energy kinetic energy electrical energy1 ptlights on a stage can be examples of all of the following forms of energy exceptelectrical energylight energythermal energysound energywhen one type of energy changes to another this is called energy energy is stored based on their position or shape this is called energy.kinetic potential sound electromagnetic

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."