Which condition is important for a temperature inversion? two layers of warm air

two layers of warm air, one on top of the other

a layer of warm air over a
layer of cold air

a layer of cold air over one of warm air

the answer is that"a layer of warm air over a layer of cold air" which can be caused by factors like formation of fronts, scattering, advection.

cancer   is   essentially   uncontrolled   mitosis   of specialized cells

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: