Which of the following is true for $T-$lymphocytes in mammals?
- AThey consist of three main types: $T-$cells,helper $T-$cells,and suppressor $T-$cells.
- BThey are produced in the lymphoid tissue.
- CThey clean up injured cells and cellular debris.
- DThey are produced in the thyroid gland.
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$(ii)$ Mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts is a physiological barrier.
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