List the atmospheric layers, temperature, altitude and density of those layers, and a unique object found in those layers.

On the basis of chemical composition, the atmosphere is divided into: Homosphere and Hetarosphere.

Explanation:

Homosphere is extended upto 90kms and uniformity of chemical composition is found here. The Homosphere is further divided into Three thermal layers:

i) Troposphere: Lowest layer of the atmosphere, extended up to 16 km at the equator,  All weather Phenomenon are restricted to this layer.

ii) Stratosphere: extended up to 25-30 km , where 50 km is upper limit. temperature becomes 0 degree C at 50 km, Circulation of Feable winds and cirrus cloud is found here, Ozone layer is found in this layer. Aeroplans fly in this layer.

iii) Mesosphere: Extends up to 50-80 km, Temperature decreases with height.

Hetarosphere is also consist of three layers:

i) Thermosphere: 80 km above the mesosphere, density is extremely low.

ii) ionosphere: extends between 80-640 km, radio waves travels through this layer.

iii) Exosphere: between 640 km, Density becomes extremely low.

b.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.