Which best describes a tetrad?
o a. a diploid cell
o b. four chromatids
o c. two gametes
o d. a haploid cell

The correct answer is B.) Four Chromatids

Explanation:

d. sodium chloride ions.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.