N counting 100 leukocytes you are accurately able to distinguish 15 basophils. Is this a normal number for the white blood cell count, and what possible health implications can you draw from this?

they have sperm in my gf's mouth

explanation:

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."