Which of the following is a correct sequence of levels of biological organization ?

Options

A. chemical, cellular , organ , tissue
B. chemical , cellular , tissue , organ
C. tissue , organ , cellular , organsystem
D. cellular , organ , tissue , organsystem

Answer

To determine the correct sequence of levels of biological organization, we need to understand the hierarchy of biological structures. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Atoms and Molecules**: The most basic level of biological organization starts with atoms, which combine to form molecules. For example, carbon, hydrogen, oxygen, and nitrogen are essential atoms that form molecules like proteins, lipids, and carbohydrates.

2. **Cellular Level**: Molecules come together to form cellular components, which are the building blocks of life. This includes organelles such as mitochondria, nucleus, and vacuoles. Cells are the basic unit of life.

3. **Tissues**: Groups of similar cells that work together to perform a specific function form tissues. For example, muscle tissue is made up of muscle cells.

4. **Organs**: Different types of tissues combine to form organs. Each organ has a specific function. For example, the kidney is an organ made up of various tissues.

5. **Organ Systems**: Groups of organs that work together to perform complex functions form organ systems. For example, the excretory system includes the kidneys, bladder, and ureters.

6. **Organism**: Finally, several organ systems work together to form a complete organism. For example, a human body is made up of multiple organ systems like the circulatory system, respiratory system, and excretory system.

### Correct Sequence:
The correct sequence of biological organization is:
- Atoms → Molecules → Cells → Tissues → Organs → Organ Systems → Organism

Based on the options provided in the question, the correct answer is **Option B**: Chemical (Atoms and Molecules), Cellular (Cells), Tissue, Organ, Organ System.