Killing pathogens and then using them to provide the body with active immunity is called . This is often done in young children. When the immune system treats otherwise harmless substances, such as pollen, as if they were invaders, a/n can occur.
HIV is a virus that attacks in the body, weakening the immune system.
Polio used to be fairly common and devastating. Thanks to widespread vaccination against polio, the disease is now considered , no longer infecting nearly as many people as it once did.
Arthritis is an example of a/n , where part of a person’s body is identified as foreign and attacked by the person’s immune system.
Respond to the following based on your reading.

Colonization is largely blamed for bringing smallpox to the Americas. Why was this disease so devastating to Native Americans? Why can we now travel to different parts of the world and avoid contracting analogous diseases?

Killing pathogens and then using them to provide the body with active immunity is called IMMUNIZATION . This is often done in young children.

When the immune system treats otherwise harmless substances, such as pollen, as if they were invaders, a/n ALLERGY can occur.

HIV is a virus that attacks WHITE BLOOD CELLS in the body, weakening the immune system.

Polio used to be fairly common and devastating. Thanks to widespread vaccination against polio, the disease is now considered ABSENT, no longer infecting nearly as many people as it once did.

Arthritis is an example of a/n AUTOIMMUNE DISORDER where part of a person’s body is identified as foreign and attacked by the person’s immune system.

Immunization helps involves the injection of dead pathogens into the bloodstream. This helps in the release of antibodies which helps in protecting the body against further attacks in the future.

Allergy happens as a result of the body system treating and attacking harmless substances.

This is because the ships which brought immigrants into the country had someone who had small pox on board which spread and many got infected and killed due to lack of vaccine and treatment.

Immunization helps people to travel without having to worry about diseases.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )