Answer:
The answer is not in any of the options and is the following:
to eliminate any remaining Hfr cells.
Explanation:
In a medium that has a streptomycin antibiotic it is used to kill Hfr donor cells after the conjugation is interrupted. This is entirely due to the streptomycin sensitivity allele (str-s) which are found in Hfr strains. The presence of the streptomycin resistance allele, located in the receptor, is used for the specific destruction of Hfr donor cells after conjugation occurs.
The right answer is higher-than-average sea levels.
With the rise in CO2 level that caused an increase in air temperature and sea surface temperatures. At this time, they were the highest ever recorded. In addition, the rise in mean sea level continued and the extent of Arctic sea ice was well below normal for most of the year.
I think the answer is organisms