Darwin's theory of evolution by natural selection can explain how antibiotics are becoming defective because the bacteria that is trying to be fought off might have had a mutation making it more likely to survive. Once that surviving bacteria makes offspring most of the first generation will die from the antibiotic but soon all of their offspring will produce a resistance to that antibiotic.
The answer is
A
Behavior isolation is behaviors involved in mating which could also cause it to prevent mating
Gametes or sex cells.considered as haploid because they having a single set of impaired chromosomes.
so letter A,
Phylum Bacteria are the major lineages(Known as Phyla or Divisions) of the domain bacteria.
