Answer:
A tissue is classified as a cluster of cells that work together to perform a particular task and are structurally similar. In multicellular species, the use of tissues provides structural and mechanical strength and enables division of labour. For example, nerve cells from the nervous tissue help in the transmission of messages.
Multicellular organisms
Multicellular organisms are composed of more than one cell, with groups of cells differentiating to specialized functions. For example, cells differentiate early in development in humans to become nerve cells, skin cells, muscle cells, blood cells, and other types of cells. The cells of multicellular organisms may also look different according to the organelles needed inside of the cell.
They possess distinct organs and organ systems.
Their cells exhibit division of labour.
Their size increases with the number of cells in an organism.