Explanation:
When the speed of sound near the ground is reduced, (such as on a cold day when the layer of air nearest ground is colder than the air above) the higher speed of the wavefronts above cause a bending of sound toward the ground.
Protons have a positive charge
I don’t know because it’s very difficult
D. there would be less energy transferred to the higher trophic levels
the new momentum would be 40000 units as momentum = mass × velocity