Which of the following provides passive immunity?

Given below are two statements:
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 the above statements,choose the most appropriate answer from the options given below:

Which type of immunity has evolved in higher vertebrates?

In passive acquired immunity,.........

Which of the following barriers is $NOT$ included in innate immunity?

The spleen primarily contains which types of cells?