Choose the correct statement

Options

A. Invertebrates evolved about `700` mya
B. Jawless fishes probably evolved about `500` mya
C. The lobe fin fishes like Coelacanth are thought to have evolved into the first amphibians
D. First eukaryotic probably evolved one billion year ago

Answer

To solve the question "Choose the correct statement," we will analyze each option provided and determine which one is accurate based on biological evolution.

### Step-by-Step Solution:

1. **Evaluate the First Option:**
- The statement claims that "Invertebrates evolved around 700 million years ago, but invertebrates are the first microscopic organisms that appeared in the sea about 3.5 billion years ago."
- **Analysis:** Invertebrates did indeed appear much earlier than 700 million years ago. The first microscopic organisms, which were prokaryotic, appeared around 3.5 billion years ago. Therefore, this option is incorrect.

2. **Evaluate the Second Option:**
- The statement claims that "jawless fishes probably evolved about 500 million years ago."
- **Analysis:** Jawless fishes are indeed one of the earliest vertebrates, but they evolved around 350 million years ago, not 500 million years ago. Thus, this option is also incorrect.

3. **Evaluate the Third Option:**
- The statement claims that "the lobe fin fishes called coelacanth are thought to have evolved into the first amphibians."
- **Analysis:** Lobe-finned fishes, including coelacanths, are believed to have given rise to the first amphibians around 395 million years ago during the Devonian period. This statement is accurate, making this option correct.

4. **Evaluate the Fourth Option:**
- The statement claims that "first eukaryotic probably evolved 1 billion years ago."
- **Analysis:** Eukaryotic cells are estimated to have evolved around 2 billion years ago, not 1 billion years ago. Therefore, this option is incorrect.

### Conclusion:
After evaluating all the options, the correct statement is: "The lobe fin fishes called coelacanth are thought to have evolved into the first amphibians."

### Final Answer:
The correct statement is: **The lobe fin fishes called coelacanth are thought to have evolved into the first amphibians.**

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