What scientist first proposed that the sun is the center of the solar system?
a. brahe
b. kepler
c. ptolemy
d. copernicus

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.

Cutting and burning the skin are two examples of

Which interaction between the atmosphere and biosphere takes place during plant respiration? plants use nitrogen and release oxygen into the atmosphere. plants use oxygen and release carbon dioxide into the atmosphere plants rely on available sunlight and release oxygen into the atmosphere. plants rely on mineral content in the ground and release carbon dioxide into the atmosphere.