Which of the following is a missing link?

Options

A. Balanoglossus
B. Omithorhyncus
C. Archaeoptaryx.
D. More than one option is correct.

Answer

To determine which of the given options is a missing link, let’s analyze each option step by step.

### Step 1: Understand the concept of a missing link
A missing link refers to a transitional fossil that exhibits traits common to both an ancestral group and its descendants. It is often a species that provides evidence of evolutionary change.

**Hint:** Think about what constitutes a missing link in evolutionary biology.

### Step 2: Analyze Belanoglossus
Belanoglossus is known to be a transitional form between invertebrates and vertebrates. However, it is still extant (currently existing) and not just known from fossils.

**Hint:** Consider whether the organism is still alive or only known from fossils.

### Step 3: Analyze Ornithorhynchus
Ornithorhynchus, commonly known as the platypus, is an egg-laying mammal. While it does represent a unique evolutionary branch, it is also a living species and not a missing link.

**Hint:** Determine if the organism is a current species or a fossil.

### Step 4: Analyze Archaeopteris
Archaeopteris is a genus of extinct plants that is considered a missing link between reptiles and birds. It is known only from fossils, which makes it a candidate for a missing link.

**Hint:** Look for evidence of extinction and fossil records when identifying a missing link.

### Conclusion
Based on the analysis, the correct answer is **Archaeopteris**, as it is a missing link known only from fossils and connects reptiles to birds.

**Final Answer:** Archaeopteris (Option C)