7 While visiting a historical fort, John watched a demonstration of the firing of an old cannon from a distance of 50 m. When
the cannon fired, John heard a loud boom a second later. What was the medium that allowed the sound waves to reach
John?
A the ears
B the cannon
C the air
D the ground

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

How do living things obtain phosphorus

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit