A) must reproduce inside cells of the host.
B) are considered to be parasitic.
C) easily survive in the environment outside the body.
D) must reproduce inside cells of the host and are considered to be parasitic.
E) must reproduce inside cells of the host, are considered to be parasitic, and easily survive in the environment outside the body.

A) spleen.
B) thymus.
C) GALT.
D) lymph nodes.
E) tonsils.

A) lymphocytes
B) dendritic cells
C) macrophages
D) neutrophils
E) monocytes