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 right answer for the question that is being asked and shown above is that: Aerobic Respiration by definition is<span> the process of producing cellular energy involving oxygen. If </span><span>the aerobic respiration process broke down in a tropical rain forest, then the tropical rain forest cannot produce foods.</span>
The part of the brain the causes the client’s symptoms is
the cerebellum. It is because she or he is having trouble to control or coordinate
movements and the balance control in which the cerebellum is responsible of
coordinating functions.
The correct answer to your question is the last one; how species change over time.
Hope that helps!
