Explanation:

Blood is considered a connective tissue because:

• It originates from mesoderm, like other connective tissues.
• It has a fluid matrix (plasma) that connects different parts of the body by transporting nutrients, oxygen, and waste.
• It contains cells (RBCs, WBCs, platelets) suspended in plasma.

Unlike muscular or epithelial tissues, blood does not provide structural support but serves as a medium for transport and immune responses.