E. coli is a species of bacteria that causes many different infections in humans. certain e. coli strains have developed resistance to antibiotics, making infections with these strains difficult to treat. how do bacteria such as e. coli, which reproduce asexually, gain new traits such as antibiotic resistance? a. by mutating their dna in response to environmental conditions to gain beneficial traits b. by adapting to changes in environmental conditions without undergoing changes in their dna c. by producing offspring with new gene assortments from genetic recombination, which increases diversity in a population d. by undergoing spontaneous mutations when they replicate, which increases genetic variation in a population

By undergoing spontaneous mutations when they replicate, which increases genetic variation in a population.

Explanation:

The research I did showed it was D.

D.  by undergoing spontaneous mutations when they replicate, which increases genetic variation in a population

Explanation:

Took the test!

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

the answer will be a) proteins i believe