In bohr's atomic theory when electron moves from one energy level to another energy level closer to the nucleus:
a. energy is emitted
b. energy is absorbed
c. no change in energy occurs
d. light is emitted
e. more than one of these might occur

1. list three scientific reasons cockroaches may fly.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness