Answer: Level B provides the same respiratory protection as Level A but less skin or outer body protection. When Level B is used: This level is used when the hazardous materials have been identified but do not require a high level of skin protection.
Explanation:
So its acquired immunity and the cells responsible are the B lymphocytes that produces antibodies against the virus. Memory is keep since first encounter of the virus by the immune system by way of the antibodies that was initially produced. The antibodies are there already, which makes it fast to act upon when expose again.
Answer:
true
Explanation:
this is because after the sleep the mind gets refreshed and for that reason it can absorb new informations.
