I need help with this question!!

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?