Which scientists was the first to discover that plants gain their mass from water?

What best describes the dropping height of a ball that bounces back up to a height of 45 cm

Need with these questions . need the answers in a rush for these questions are the answers i put down are correct or not? ?

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d