The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as

The part of the earth and thin layer of air above its surface, which s

1.	The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as
A.	stratosphere
B.	ionosphere
C.	biosphere
D.	mesosphere
Answer» D. mesosphere