What are human body tissues

Human body tissue are groups of cells that have a familiar structure and  they function together as a unit, like gears. There are multiple tissue (up to four) types (up to four) in the body; Epithelial, Connective, Muscle, and Nervous. Each tissue is used for different/specific functions in the body.

a chain link fence because there so tiny even my albino donkey can't get out

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.