Answer:
An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
9 organs
Explanation:
Thymus
Spleen
Appendix
Bone marrow
Lymph Nodes
Tonsils
Adenoids
Lymphatic Vessels
Peyer's Patches
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