They provide the immune system with "memory" against previously encountered pathogens.
T memory cells are necessary for protective immunity against invading pathogens
Answer:
the characteristics of herbaceous stems are a, b, and d.
Explanation:
Answer:
Archaeocytes
Explanation:
Archaeocytes are very important to the functioning of a sponge. These cells are totipotent, which means that they can change into all of the other types of sponge cells.