In evolution, the studies can be made at molecular level. For example, the proteins present in the blood of man and ape similar. The base sequence in nucleic acids and amino acids sequence in proteins of related organism is alike. These are the examples which are specifically referred to in

Options

A. convergent evolution
B. molecular analogy
C. molecular homology
D. homoplastic appearance.

Explanation

**Step-by-Step Solution:**

1. **Understanding Molecular Evidence in Evolution:**
- The question highlights that studies in evolution can be conducted at the molecular level, indicating that similarities in proteins and nucleic acids can provide insights into evolutionary relationships.

2. **Examples of Similarities:**
- It mentions that the proteins present in the blood of humans and apes are similar, which suggests a close evolutionary relationship. This similarity can be observed in the amino acid sequences of proteins and the base sequences in nucleic acids (DNA/RNA).

3. **Phylogenetic Relationships:**
- The similarities in molecular structures (proteins and nucleic acids) can help determine how closely related two organisms are. If two organisms share similar molecular characteristics, they are likely to have a common ancestor.

4. **Homologous Structures:**
- The concept of homologous structures is introduced, which refers to anatomical similarities in different species that arise from a common ancestor. For example, the forelimbs of humans and whales have similar bone structures but have evolved to serve different functions.

5. **Divergent Evolution:**
- The differences in function despite similarities in structure are explained by divergent evolution, where related species evolve different traits while retaining a common structural framework.

6. **Molecular Homology:**
- The conclusion drawn is that just as anatomical structures can show homology, so can molecular structures. The term "molecular homology" is used to describe the similarity of biomolecules (like proteins and nucleic acids) in closely related organisms.

7. **Final Answer:**
- The correct term that refers to the similarities at the molecular level in the context of evolution is "molecular homology."

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