Read the given passage and answer the following questions. Siddhi studied forelimbs of three organisms and described them as follows: Organism X - Long and short bones, covered with muscles, used for running. Organism Y - Long and short bones, covered with feathers used for flying. Organism Z - A layer of a complex chemical with supporting framework which is not made of bones and used for flying.
Forelimbs of organisms X and Y are ____organs while forelimbs of organisms Y and Z are ____organs.

Options

A. Analogous, Vestigial
B. Homologous, Vestigial
C. Analogous, Homologous
D. Homologous, Analogous

Explanation

To solve the question regarding the forelimbs of the organisms described by Siddhi, we need to analyze the information provided about each organism and understand the concepts of homologous and analogous organs.

### Step-by-Step Solution:

1. **Identify the Organisms and Their Forelimbs:**
- **Organism X:** Has long and short bones, covered with muscles, and is used for running.
- **Organism Y:** Has long and short bones, covered with feathers, and is used for flying.
- **Organism Z:** Has a layer of a complex chemical with a supporting framework not made of bones, used for flying.

2. **Determine the Type of Organs for Organisms X and Y:**
- Both Organism X (which is likely a mammal, such as a human) and Organism Y (a bird) have similar bone structures (long and short bones) but serve different functions (running vs. flying).
- Since they share a common structural feature (bones) but have different functions, their forelimbs are classified as **homologous organs**.

3. **Determine the Type of Organs for Organisms Y and Z:**
- Organism Y (bird) and Organism Z (insect) both serve the function of flying but have different structural compositions (bones vs. a complex chemical framework).
- Since they perform the same function (flying) but do not share a common structural feature, their forelimbs are classified as **analogous organs**.

4. **Final Answer:**
- The forelimbs of organisms X and Y are **homologous organs**.
- The forelimbs of organisms Y and Z are **analogous organs**.

### Summary:
- Forelimbs of organisms X and Y are **homologous**.
- Forelimbs of organisms Y and Z are **analogous**.