A population of bacteria sees an increase in the number of bacteria resistant to a certain antibiotic over a number of generations. This is known as .

MICROEVOLUTION

Explanation: Microevolution simply means those changes in the alleles frequencies of an organism over time.

In other words,we will say that microevolution is the generation to generation change in a population's frequencies of alleles.

These changes can occur due to natural or artificial selection,

Gene flow, mutation and genetic drift.

From the question asked,when a population of bacteria sees an increase in the number of bacteria resistant to a certain antibiotic over a number of generations,it is simply known as microevolution.

answer; i believe is(b)converging

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]