Severe allergic reactions cause a wide-spread release of histamine and inflammation. the connective tissue cells involved are the

The connective tissue cells that are involved with allergic reactions of which causes release of histamine and to promote the cause of inflammation is the mast cells. The mast cells are the type of cell in the connective tissue that contains basophil granules and they are responsible of promoting allergic reactions.

i thinking chemical change

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.