All living organisms are linked to one another because

Options

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

Explanation

**Step-by-Step Solution:**

1. **Understanding Common Genetic Material:**
- All living organisms share a common genetic material, primarily DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). This genetic material is fundamental for the processes of life, including growth, reproduction, and response to the environment.

2. **Variability in Genetic Material:**
- While all living organisms have genetic material, the type and structure can vary. For example, some organisms may have different forms of RNA, and the DNA sequences can differ significantly among species. This indicates that while they share commonality, there are also varying degrees of genetic differences.

3. **Cellular Organization:**
- All living organisms exhibit a common cellular organization. They are made up of cells, which are the basic units of life. Cells group together to form tissues, tissues form organs, and organs work together in organ systems. This hierarchical organization is a characteristic feature of all living organisms.

4. **Conclusion:**
- Given that all living organisms share common genetic material (though to varying degrees) and have a common cellular organization, we can conclude that they are all linked to one another through these fundamental biological principles.

5. **Final Answer:**
- Therefore, the correct answer is that all living organisms are linked to one another because they share common genetic material and have a common cellular organization. Hence, the answer is "All of the above."

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