Which of the following sequences represents the hierarchy
ofbiological organization from the least to the most
complexlevel?

1. cell, community, population, organ system,
molecule, organelle.
2. organelle, tissue, biosphere, ecosystem,
population, organism.
3. organism, community, biosphere, molecule, tissue, organ.
4. molecule, cell, organ system, population,
ecosystem, biosphere.
5. ecosystem, cell, population, tissue, organism, organ
system.

4) molecule, cell, organ system, population, ecosystem, biosphere

Explanation:

Various biomolecules such as carbohydrates, proteins, lipids, etc. together make the cells. Cells are the structural and functional units of life. A group of cells destined to perform specific functions makes tissues and various specific tissues together make an organ.

An organized group of tissues and organs that work cooperatively to perform a specialized set of functions is called an organ system. For example, the digestive system includes organs involved in the breakdown of nutrients.

A group of organisms of the same species that live in a defined geographic area at the same time make a population. Ecosystem refers to an interacting system including a biotic community and its nonliving, physical environment.  The biosphere includes all of the parts of Earth where life forms exist and include the atmosphere, the hydrosphere and the lithosphere.

b.