To lift a baby from a crib 50 J of work is done. How much power is needed if the baby is lighted in 0.5s?

Answer increases the risk of developing genetically influenced diseases;

Repeated trials allow you to calculate a mean which can reduce the effect of random errors to make your results more precise.your results will also be reproducible therefore if someone else did the same experiment they'd get the same results which would make your results more reliable.