Law of embryonic development was proposed by

Options

A. Darwin
B. Von Baer
C. Haeckel
D. Mendel

Answer

To answer the question regarding who proposed the Law of Embryonic Development, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Law of Embryonic Development**:
- The Law of Embryonic Development states that the organs or body parts that develop early in the embryonic stage are more similar across different species than those that develop later. This suggests a common ancestry among different organisms.

2. **Identify the Key Contributors**:
- The question provides four options: Darwin, Von Wehr, Haeckel, and Mendel. We need to identify who among these is associated with the Law of Embryonic Development.

3. **Analyze Each Option**:
- **Darwin**: Known for the theory of evolution by natural selection but not specifically for embryonic development.
- **Haeckel**: Proposed the biogenetic law, often summarized as "ontogeny recapitulates phylogeny," but not the specific law in question.
- **Mendel**: Known for his work in genetics and the laws of inheritance, not embryonic development.
- **Von Wehr**: This is a misnomer; the correct name is Ernst von Baer, who is credited with the Law of Embryonic Development.

4. **Correct Answer**:
- The law is actually attributed to Ernst von Baer, so the correct answer to the question is **Option 2: Von Wehr** (assuming the question meant to refer to Von Baer).

### Final Answer:
The Law of Embryonic Development was proposed by **Option 2: Von Wehr** (referring to Ernst von Baer).