How is modern Earth different from Earth over four billion years ago?
A. Constantly bombarded with comets and asteroids
B. Little to no oxygen
C. High levels of ultraviolet radiation
D. Protective atmosphere

Question

How is modern Earth different from Earth over four billion years ago? 
A. Constantly bombarded with comets and asteroids
B. Little to no oxygen
C. High levels of ultraviolet radiation
D. Protective atmosphere

XxXNessalulbaddieXxX · Answer

which one do u think it is?/

kaibeth · Answer

D. maybe because we didn't have a very protective atmosphere as much as we do today?

XxXNessalulbaddieXxX · Answer

@kaibeth wrote:

D. maybe because we didn't have a very protective atmosphere as much as we do today?

yea i think ur right (:

kaibeth · Answer

thanks

XxXNessalulbaddieXxX · Answer

@kaibeth wrote:

thanks

no problemmloo