Questions: What is the function of neural crest cells?

The answer is the fourth one: they form nerves and facial features.

Explanation for each option:

1. They form the liver and the stomach.

   • Incorrect. The liver and stomach are primarily derived from the endoderm, not neural crest cells.

2. They form lungs and head features.

   • Partially correct. While neural crest cells contribute to some head features, they do not form the lungs. The lungs are derived from the endoderm.

3. They form the pancreas and the kidneys.

   • Incorrect. The pancreas and kidneys are derived from the endoderm and mesoderm, respectively, not from neural crest cells.

4. They form nerves and facial features.

   • Correct. Neural crest cells are known for their role in forming parts of the peripheral nervous system, including nerves, and they also contribute to the development of facial features and structures.

In summary, neural crest cells are crucial in the development of nerves and facial features, among other structures.