a mature egg is fertilized when it is joined with a sperm cell
the answer is B
Answer:
has no nucleus; found in unicellular organisms
Explanation:
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Infectious diseases<span> are those that are </span>transmitted<span> from person to person by direct or indirect contact. Viruses, bacteria, parasites, and fungi all cause infectious </span>disease<span>. Malaria, measles, and respiratory illnesses are examples of infectious </span>diseases<span>.</span>