Students of different ages were given the same jigsaw puzzle to put together. they were timed to see how long it took to finish the puzzle. which on is the independent variable, dependent variable, and controlling variables?

The independent variable is the ages. The dependent variable is the how long it takes. The controlling variable is that they were given it at the same time.

Age is the independent. Jigsaw is the controlling variable. Time is the dependent. I think!!!

A) the enthralling of formation for pure element in its standard state is always positivehope this : )

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy