Darwin hypothesized that there are definite steps to natural selection. consider the model of bacterial resistance to antibiotics. use the roman numerals (i - iii) to guide you through the steps to describe how darwin would explain antibiotic resistance. a) there is a change in the environment: an antibiotic is added. some of the bacteria adapt to the new environment. they survive and reproduce. b) in any population, variation exists. some bacteria are resistant to antibiotics. most bacteria die, but the bacteria that are resistant survive and reproduce. c) sexual reproduction of bacteria cause variation. some bacteria survive antibiotics and some do not. regardless, over time all of the bacteria should become extinct. d) in a population of bacteria that are exposed to antibiotics, some bacteria are able to change their genetic make-up and survive. the new genotype is passed on to offspring.

Answer : The correct answer is -

Option B).

According to Natural selection (which is an evolutionary theory, proposed by Darwin) -

In a population, organisms that are capable of adapting the changing environmental situation (due to the beneficial gene in their genome), survive and increase their number through reproduction whereas other are eliminated from the population.

In other words, genetic variation exist in any population and the beneficial allele/gene favors the survival of organsims as they are capable of adapting the changing environment (such as exposure to antibiotic in this question).

As per this information, we can conclude that option B) is the right answer.

cancer   is   essentially   uncontrolled   mitosis   of specialized cells

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).