Answer:
The second one is correct
Explanation:
A leukocyte is responsible for the immune system
Not all bacteria are harmful because some of them are beneficial to the body that are commonly found in the stomach, mouth and esophagus. These friendly bacterial is called probiotics. Two of the most beneficial uses of bacteria is it helps in regulating the bowel movement since bacteria helps in the processing of body wastes. Another benefit of bacteria is that it improves the immune system. It is done by increasing the antibodies to fight the dangerous bacteria.
The answer is genetic drift. This is the <span>change</span> of allelic frequency in a population due
to natural selection in <span>favor</span> of particular
traits. The effect of natural drift is <span>greater</span>
is a population of small size that in a big population. When the allelic
frequency of the isolated group of plants reaches 0, it is <span>deemed</span> as lost.