Which of the following organisms invaded the land first?

Options

A. Plants
B. Coelcanth
C. Amphibians
D. Reptiles

Answer

To determine which of the following organisms invaded the land first, we can analyze the options provided:

1. **Plants**
2. **Silicon**
3. **Amphibians**
4. **Reptiles**

### Step-by-Step Solution:

**Step 1: Understand the meaning of "invaded the land."**
- The term "invaded the land" refers to the first organisms that adapted to live on terrestrial environments rather than aquatic ones.

**Hint for Step 1:** Think about the transition from water to land and which organisms are known to have made that transition first.

**Step 2: Analyze the options.**
- **Plants:** The first organisms to colonize land were plants, which adapted to terrestrial life by developing structures to support themselves and mechanisms to conserve water.

**Hint for Step 2:** Consider the evolutionary timeline of life forms and which groups are known to have adapted to land first.

- **Silicon:** This option seems to be a typographical error or misunderstanding. If it refers to "sarcopterygian fish" (lobe-finned fish), these fish are known to have developed adaptations for moving onto land but came after plants.

**Hint for Step 3:** Clarify what "silicon" might refer to in this context and its relevance to land invasion.

- **Amphibians:** Amphibians evolved later from fish and are capable of living both in water and on land. They are not the first to invade land but rather the first vertebrates to do so.

**Hint for Step 4:** Think about the characteristics of amphibians and their evolutionary history.

- **Reptiles:** Reptiles evolved from amphibians and are fully adapted to life on land, but they came after amphibians.

**Hint for Step 5:** Consider the evolutionary lineage and how reptiles relate to amphibians.

**Step 3: Conclusion**
- Based on the analysis, the first organisms to invade the land were plants. They established themselves on land before any animals, including amphibians and reptiles, evolved.

**Final Answer:** The organism that invaded the land first is **Option 1: Plants.**