Question

the smallest unit of an organism capable of life by itself is: an organ an organelle tissue a cell a nucleus

Explanation:

• An organ is made up of tissues and is not the smallest unit capable of life.
• An organelle is a part of a cell and cannot live independently.
• Tissue is a group of cells and not the smallest unit.
• A nucleus is an organelle within a cell and cannot live on its own.
• A cell is the basic structural and functional unit of life. It can perform all the necessary functions for life (such as metabolism, growth, reproduction) on its own.

Answer:

a cell