↪️The Sun is a __________? Star

↪️ The gas used in a refrigerator to cool water is___________? Ammonia

↪️The average adult has a blood volume of about __________ liters. 5

↪️The most abundant element in the universe is __________. Hydrogen

↪️ The most abundant element in the Earth’s crust is __________? Oxygen

↪️ Each day human body breathe in __________ liters of air. 15,000 to 20,000

↪️Deficiency of Vitamin-D results in __________? rickets

↪️ The SI unit of “pressure” is _________. pascal

↪️ The most densest substance on the Earth is __________. *Osmium*

↪️A camera uses a __________ to form an image. convex lens