Evolution is the sequence of gradual changes which takes place in the primitive organisms, over millions of years, in which new species are produced. Variations that resulted in formation of new species occurred basically due to errors in DNA copying as well as due to sexual reproduction.
Which of these techniques were used in study of human fossils?

Options

A. excavation
B. time dating
C. fossil study
D. all of these methods

Answer

To answer the question about the techniques used in the study of human fossils, we can break down the solution into several steps:

### Step-by-Step Solution:

1. **Understanding Evolution**: Begin by recognizing that evolution is the gradual change in species over millions of years, leading to the emergence of new species from primitive organisms.

2. **Identifying Techniques**: The question asks about the techniques used in studying human fossils. These techniques include:
- **Excavation**: This is the process of digging up fossils from the ground. It allows researchers to uncover not only fossils but also tools and other artifacts that provide insight into the lives of early humans.
- **Time-Dating**: This technique helps determine the age of the fossils. It involves methods such as radiocarbon dating, which can estimate how long ago the organisms lived based on the decay of carbon isotopes.
- **Fossil Study**: This involves analyzing the physical characteristics of the fossils to understand their structure and how they relate to modern humans and other species.

3. **Conclusion**: After considering the techniques mentioned, it is clear that all of these methods—excavation, time-dating, and fossil study—are essential for studying human fossils. Therefore, the correct answer is that all these methods are used in the study of human fossils.

### Final Answer:
The techniques used in the study of human fossils are: **Excavation, Time-Dating, and Fossil Study. Therefore, the answer is all of these methods.**

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