When the use of penicillin began during World War II, it saved thousands of soldiers lives. Today, treatment of many infections by penicillin, which was successful in the past, is no longer effective. What is the best explanation for this change?

MODERN THEORY OF EVOLUTION

Please wait while the activity loads.
If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If loading fails, click here to try again

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

When the use of penicillin began during World War II, it saved thousands of soldier’s lives. Today, treatment of many infections by penicillin, which was successful in the past, is no longer effective. What is the best explanation for this change?

A	Other species of bacteria that penicillin does not affect mutated and now cause these infections.
B	In response to so many being killed by antibiotics, bacteria began mutating into resistant strains.
C	A variation for immunizations to penicillin already existed and became predominant in surviving bacteria.
D	Since the need existed to survive the penicillin effect, bacteria responded by developing immunities.

Explanation:

Detailed explanation-1: -What is one method that the biologist could use to determine how closely the different types of finches are related? Look at the color of their feathers. Look for analogous structures. Study the environment in which each type of finch lives.

Detailed explanation-2: -Individuals with adaptive traits-traits that give them some advantage-are more likely to survive and reproduce. These individuals then pass the adaptive traits on to their offspring. Over time, these advantageous traits become more common in the population.

There is 1 question to complete.