Which layer of the atmosphere is the most vital for supporting life on earth?

a. troposphere
b. stratosphere
c. mesosphere
d. thermosphere

it is the troposphere because it supports the majority of the life on earth

The correct answer is a. troposphere.

The lowest layer of Earth's atmosphere is the troposphere. It extends up to 10 km above the sea level. It consists of about 75% mass of the atmosphere and 99 % of the mass of water vapors. Most of the clouds and all weather conditions are exist in the troposphere. Thus, troposphere is suitable for the existence of the life forms.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.