Describe the rool each element plays in the life of a plant.
a)soil
b)water
c)light

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

What produces wave a)sound b) heats c)transfer of energy d)vibrations