While the tadpoles of competing species may complete metamorphosis in as little as just a few short months, Bullfrog tadpoles can remain in the same state for as long as one to two years before they actually become adult frogs.
Two types of white blood cells called lymphocytes are vital to the specific immune response. Lymphocytes are produced in the bone marrow, and mature into one of several subtypes. The two most common are T cells and B cells. An antigen is a foreign material that triggers a response from T and B cells.
In Immune System. Both are T and B lymphocytes are produced in bone marrow, but B lymphocytes mature in bone marrow and are part of the humoral response, while T lymphocytes mature in the t â¦ hymus gland and are part of the cell mediated response.hare to: There are different types of B cell and T cell. both are lymphocytes, a subclass of white blood cell. the T cells are mainly used in identifying antigens and releasing chemica â¦ ls which attact macrophages (big immune cells which 'eat' antigens), to destroy the antigen.