Some bacteria—sometimes called “super bugs”-have developed a resistance to
certain antibiotics. How does drug resistance develop in bacteria?
A. Unsanitary conditions allow all kinds of bacteria to breed, including those that
are antibiotic resistant.
B. In the bloodstream, different species of bacteria exchange genes and become
resistant to antibiotics.
C. Mutations in some bacterial genes make the bacteria stronger and better able to
defeat the body's immune system.
D. In the presence of an antibiotic, bacteria with genes that make them resistant
survive and eventually take over the population.

answer; the above answer to the above statement is (true)

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.