Sustancia pura formada por la combinacion de elementos, es decir por atomos distintos, en una
proporcion definida, sus molecular son iguales?.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.