A. <span>Exposure to an antigen
Exposure to viruses and antigens led to the foundation of modern vaccination. Vaccination introduces an antigenic material that helps the ability of the immune system to adapt a specific pathogen, therefore leading to a long-term immunity.</span>
The law of independent assortment<span> states that traits are passed from parents to offspring independently of one another.</span>
Perigee is the correct answer. T<span>his high tide is also known as the proxigean </span>spring tide<span>.</span>
A Moon mark as brainliest if correct
Involved a dramatic and sudden increase
