Correct hierarchy of levels of organisation is

Options

A. atoms `rarr ` molecules `rarr ` cell `rarr ` tissue `rarr ` individual `rarr ` ecosystem `rarr ` biosphere
B. atoms `rarr` molecules cells `rarr` tissue `rarr` organs `rarr` individuals `rarr` ecosystem `rarr` biosphere
C. atoms `rarr ` molecules`rarr ` cells `rarr ` tissue `rarr` organs `rarr` individual `rarr `population`rarr ` ec- osystem `rarr ` biosphere
D. atom `rarr` molecule `rarr` cells `rarr` tissue `rarr` organs `rarr` and indviduals `rarr` populati on `rarr` community `rarr` ecosystem `rarr` biosphere

Answer

To answer the question regarding the correct hierarchy of levels of organization in biology, we will outline the steps involved in understanding this concept.

### Step-by-Step Solution:

1. **Understanding Levels of Organization**: The biological organization starts from the smallest unit of life and progresses to the largest. The hierarchy includes various levels that represent the complexity of living organisms.

2. **Starting from Atoms**: The smallest unit is the atom. Atoms combine to form molecules, which are the building blocks of life.

3. **Molecules to Cells**: Molecules then combine to form cells. Cells are considered the basic unit of life.

4. **Cells to Tissues**: Similar types of cells group together to form tissues. Tissues perform specific functions in the body.

5. **Tissues to Organs**: Different types of tissues come together to form organs. Each organ has a specific function.

6. **Organs to Organ Systems**: Organs that work together to perform complex functions form organ systems. For example, the digestive system consists of various organs like the stomach and intestines.

7. **Organ Systems to Organisms**: An organ system functioning together forms an individual organism.

8. **Organisms to Populations**: A group of individuals of the same species living in a particular area forms a population.

9. **Populations to Communities**: Different populations of various species living together in a particular area form a community.

10. **Communities to Ecosystems**: Communities interacting with their physical environment (abiotic factors) form ecosystems.

11. **Ecosystems to Biosphere**: Finally, the biosphere is the highest level of organization, encompassing all ecosystems on Earth.

### Final Hierarchy:
The correct hierarchy of levels of organization is:
- Atom
- Molecule
- Cell
- Tissue
- Organ
- Organ System
- Individual (Organism)
- Population
- Community
- Ecosystem
- Biosphere

### Conclusion:
Thus, the correct sequence from the smallest to the largest level of organization is: **Atom, Molecule, Cell, Tissue, Organ, Organ System, Individual, Population, Community, Ecosystem, Biosphere**.

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