Answer:
Cell
Step-by-step explanation:
Cell is considered as a building block of any life form. A cell is the smallest unit of any living organism. When cell group together, they form tissues. and when tissues group together they form organs. The specific function of all organs is due to the constituting specialized cell which are able to perform specific function. All cells are able to survive on its own as they are able to respire, digest, produce energy, loco mote and even reproduce by themselves.
Hence, cell is the basic building block of life