The most obvious & technically complicated feature of all living organisms is

Options

A. Metabolism
B. Sense their surroundings
C. Reproduction
D. Growth

Answer

To answer the question, "The most obvious & technically complicated feature of all living organisms is," we need to analyze the given options: metabolism, sensing their surroundings, reproduction, and growth.

### Step-by-Step Solution:

1. **Understanding Metabolism:**
- Metabolism refers to the biochemical processes that occur within living organisms to maintain life, including digestion and energy production.
- While metabolism is essential for life, it is a relatively straightforward process that can be observed in many organisms, including simple ones.

**Hint:** Consider how fundamental metabolism is to all life forms and whether it can be considered complicated.

2. **Sensing Their Surroundings:**
- This feature involves the ability of organisms to perceive and respond to environmental stimuli. It includes complex systems like the nervous system and sensory organs.
- The ability to sense the environment is crucial for survival and involves intricate processes, especially in higher organisms.

**Hint:** Think about the complexity of the systems involved in sensing and responding to the environment.

3. **Reproduction:**
- Reproduction is the biological process by which new individual organisms are produced. It can be either asexual (simple) or sexual (more complex).
- While reproduction is a defining characteristic of living organisms, the complexity varies significantly between different types of reproduction.

**Hint:** Reflect on the differences in complexity between asexual and sexual reproduction.

4. **Growth:**
- Growth refers to an increase in size or mass and can occur in both living and non-living entities.
- Since growth is not exclusive to living organisms (e.g., a puddle of water can grow larger), it cannot be considered a unique or complicated feature of life.

**Hint:** Consider whether growth is a distinctive characteristic of living organisms compared to non-living things.

5. **Conclusion:**
- After evaluating all the options, the most obvious and technically complicated feature of all living organisms is the ability to **sense their surroundings**. This involves complex systems and processes that are essential for interaction with the environment and survival.

**Final Answer:** The most obvious & technically complicated feature of all living organisms is **sensing their surroundings**.