In an early experiment with plants, Jan Baptista van Helmont showed that plants did NOT make their bodies from ...*
A) water
B)air
C)soil
mushrooms
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Why are common names a problem for scientist?

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

The wind speed in the region between cities a and b was probably the greatest at noon on which day