2-Cells organization

All living things are made up of cells, which are the basic building blocks of life. In multicellular organisms, cells that carry out the same functions join together to make tissue. Tissue groups together to make organs such as the heart or lungs, which in turn form systems such as the circulatory system or the respiratory system. Together they form an organism.

CELLS → TISSUE → ORGANS → SYSTEMS → ORGANISM

There are 2 types of cells: 

Animal cells

                                                Plant cells