Write the intrinsic and extrinsic growth factors.

Answer

### Step-by-Step Solution:

**Step 1: Understand the Definitions**
- **Intrinsic Growth Factors**: These are internal factors that are present within the organism and contribute to its growth. They include biological components that regulate growth processes.
- **Extrinsic Growth Factors**: These are external factors that come from the environment and influence the growth of the organism from outside.

**Step 2: Identify Examples of Intrinsic Growth Factors**
- **Enzymes**: Biological catalysts that speed up chemical reactions in the body, aiding in growth and development.
- **Hormones**: Chemical messengers that regulate various physiological processes. Examples include:
- **Progesterone**: Involved in the growth of the uterine lining.
- **Estrogen**: Plays a role in the development of female reproductive tissues and secondary sexual characteristics.

**Step 3: Identify Examples of Extrinsic Growth Factors**
- **Sunlight**: Essential for photosynthesis in plants, which is crucial for their growth.
- **Water**: Necessary for various physiological processes and overall growth.
- **Oxygen (O2)**: Important for respiration, which provides energy for growth.
- **Nutrients**: External sources of carbohydrates, proteins, and fats that provide energy and building blocks for growth.

### Summary of Growth Factors
- **Intrinsic Growth Factors**: Enzymes, Hormones (e.g., Progesterone, Estrogen)
- **Extrinsic Growth Factors**: Sunlight, Water, Oxygen, Nutrients (Carbohydrates, Proteins, Fats)

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