All living organisms are linked to one another because

Options

A. they have common genetic material of the same _type
B. they share common genetic material but to varying degrees
C. all have common cellular organisation
D. all of above

Answer

To answer the question "All living organisms are linked to one another because," we need to evaluate the provided options and understand the connections among living organisms.

### Step-by-Step Solution:

1. **Understanding Common Genetic Material**:
- All living organisms share a common genetic material, which is primarily DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). This genetic material is responsible for the inheritance of traits from one generation to the next.
- **Hint**: Think about how traits are passed from parents to offspring.

2. **Variation in Genetic Material**:
- While all living organisms have DNA or RNA, the specific sequences of nucleotides (the building blocks of DNA and RNA) can vary significantly among different species. This means that while they share common genetic material, the degree of similarity can differ.
- **Hint**: Consider how species can be similar yet different at the genetic level.

3. **Common Cellular Organization**:
- All living organisms are made up of cells, which are the basic units of life. This cellular organization includes not just individual cells, but also tissues, organs, and systems that work together to sustain life.
- **Hint**: Reflect on the structure of living organisms and how cells form the foundation of life.

4. **Evaluating the Options**:
- **Option 1**: They have common genetic material of the same type. (True)
- **Option 2**: They share common genetic material to varying degrees. (True)
- **Option 3**: All have common cellular organization. (True)
- **Option 4**: All of the above. (True, since all previous statements are correct)

5. **Conclusion**:
- Since all three statements (options 1, 2, and 3) are true, the correct answer to the question is **Option 4: All of the above**. This indicates that all living organisms are interconnected through their common genetic material, varying degrees of genetic similarity, and shared cellular organization.

### Final Answer:
**All living organisms are linked to one another because: Option 4 - All of the above.**