This is because a sample is supposed to ideally represent the whole population from which it was taken. Taking samples from different location within the population ensures that they are no bias in the sample. Each part of the population should be well represented in the sample so that the conclusions drawn from the sample represent the properties of the whole population.
B cells mature in the bone marrow or in the lymph node. Hope I could help!
Answer:
NIBIN
Explanation:
i remember reading it in the module and i took the test and got this question correct :)