Answer:
the answer is B. Antigenic drift
Continents are land masses that exist on the surface of the earth. The continents are part of the uppermost layer of the earth which is called the crust.
Answer:
D
Explanation:
<u>Sister chromatids</u> will have the same form of alleles at the locus after S phase.
<em>This is because during the S phae of the cell cycle, sister chromatids are replicated in preparation for cell division. The replication process is quite accurate such that all the alleles present on the initial chromatids are also replicated on the new sister chromatids. Hence, both new and old chromatids will have the same form of alleles at the locus after replication at the S phase. In other words, sister chromatids are exact copy of one another.</em>
The correct option is D.
Ozone is good when it is in the stratosphere but bad when in the troposphere (where the weather system occurs). When in the stratosphere it help absorbs UV light from sunlight before reaching earth surface. This prevents damage to the genetic material of living organisms.
When in the troposphere, it is considered a pollutant and causes irritation of the lungs when inhaled. It also affects vegetation by reducing crop growth and yield.
