MCQ
World Environment Day is celebrated on :
- A6th December
- ✓5th June
- C6th January
- DNone of these
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Choose the correct option for $A$ and $B$ to complete the given $NCERT$ statement
Statement $I$ : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
Statement $II$ : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.
In the light of above statements, choose the most appropriate answer from the options given below :