Pepsin : Enzyme :: Myoglobin : ________

Explanation

To solve the analogy "Pepsin : Enzyme :: Myoglobin : ________", we need to identify the relationship between the first pair and apply it to the second pair.

1. **Identify the first term**: Pepsin is an enzyme. It is a biological catalyst that speeds up the digestion of proteins in the stomach.

2. **Identify the relationship**: The relationship here is that pepsin is a specific type of biomolecule known as an enzyme.

3. **Identify the second term**: Myoglobin is the term we need to classify in the same way as pepsin.

...