Question

which is one part of the immune system that helps protect the body from diseases?
mucus
skeleton
esophagus
fingernails

Explanation:

To solve this, we analyze each option:

• Mucus: Traps pathogens (like bacteria, viruses) and helps in the immune defense by preventing their entry into the body, being part of the innate immune system.
• Skeleton: Provides structural support, not part of the immune system.
• Esophagus: Transports food, part of the digestive system, not immune.
• Fingernails: Protect fingertips, not part of the immune system.

Answer:

A. mucus