Layer of the atmosphere with the lowest temperature is the

The coldest temperature in the atmosphere occurs at the top of the mesosphere, which is known as the mesopause, where temperature can reach about -90°C (130° F) varying according to seasons and latitude. As the mesosphere extending (approximately 50-85 km) upwards above the stratosphere, the temperature is decreasing. The air is present in the mesosphere is too thin to breathe.

Mesosphere is the 3rd major layer of the atmosphere, present directly below the thermosphere and directly above the stratosphere. In the mesosphere, the temperature decreases as the altitude are increasing.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: