Final answer:
The tissue that contains erythrocytes, leukocytes, and plasma is connective tissue, specifically blood, which is a fluid connective tissue that supports transport and immune functions.
Step-by-step explanation:
The tissue that contains erythrocytes (red blood cells), leukocytes (white blood cells), and plasma is classified as connective tissue. Blood is a fluid connective tissue that has a plasma matrix carrying these formed elements. Erythrocytes are primarily involved in the transport of oxygen and some carbon dioxide, while leukocytes are responsible for immune response. This liquid extracellular matrix also transports nutrients, salts, and wastes.
Connective tissue, by definition, binds cells and organs together, providing support and integration for various parts of the body. Unlike other types of tissues such as epithelial tissue, muscle tissue, and nervous tissue - which have functions ranging from covering body surfaces to facilitating movement and signal transmission - connective tissue serves in protection, support, and integration.