Final answer:
Leukopenia is a condition in which too few white blood cells are produced, leading to a weakened immune system and increased risk of infections and diseases. Leukocytosis, on the other hand, refers to excessive leukocyte proliferation, which can also pose health risks.
Step-by-step explanation:
Leukopenia is a condition in which too few white blood cells are produced. This can lead to a weakened immune system, making the individual more susceptible to infections and diseases. On the other hand, excessive leukocyte proliferation, known as leukocytosis, can also be problematic as the cells themselves may be nonfunctional, leaving the person at increased risk for disease.