The homologus organs are those that show similarity in

Options

A. Appearance
B. Function
C. Origin
D. Size

Answer

**Step-by-Step Text Solution:**

1. **Understanding Homologous Organs**: Homologous organs are defined as structures in different species that share a common ancestry. This means that these organs have evolved from a common ancestor, even though they may serve different functions in the present-day organisms.

2. **Similarity in Origin**: The key characteristic of homologous organs is their similarity in origin. This means that they arise from the same embryonic tissue or structure, indicating that they have a shared evolutionary background.

3. **Structural Similarity**: While homologous organs may have different functions, they often exhibit structural similarities. This means that the basic anatomy of these organs is similar, even though they may have adapted to perform different roles in different species.

4. **Functional Differences**: Although homologous organs have similar origins and structures, they perform different functions. For example, the forelimbs of humans, whales, and bats all have a similar bone structure but are adapted for different purposes: manipulation, swimming, and flying, respectively.

5. **Examples of Homologous Organs**: Common examples include the forelimbs of mammals (like humans and whales) and the flippers of whales. Despite their different functions (grasping, swimming), they share a similar structural framework.

6. **Conclusion**: Therefore, the correct answer to the question is that homologous organs show similarity in origin and structure, but differ in function. The focus is on their common ancestry rather than their size or specific appearance.