Question

Which is on part of the immune system that helps protect the body from diseases?

Answer 1

Answer:

The B lymphocytes (or B-cells) create antibodies and alert the T lymphocytes (or T-cells) to kill the pathogens. White blood cells are a part of the lymphatic system, a network of lymph vessels that collect excess fluids from tissues throughout the body and then return  to your bloodstream.

Explanation:

Answer 2

Mucus

Mucus works as a selective barrier to sensitive organs in the body.
Harmful microbes that could pass by the nose into the lungs and cause infections are taped earlier and excreted by mucus.
Mucus traps invading pathogens preventing them from reaching sensitive parts of the body thereby preventing diseases.