Answer:
Nucleus
Step-by-step explanation:
A cell can be defined as the basic and smallest unit of life. The cell carries out structurally, biological functions in the life of an organism.
The cell is made up of a nucleus and other organelles such as the cytoplasm, mitochondria, golgi body, ribosomes, lysosomes, endoplasmic reticulum, chloroplasts(for plants) e.t.c.
Living organisms are divided into two based on the type of cells that they have. We have the:
a. Eukaryotic cell: The eukaryotic cell has well defined nucleus that is enclosed in a membrane.
b. Prokaryotic cell: The prokaryotic cell does not have a well defined nucleus.