Complete the text with the words that make the most sense.

The sea hare, a large mollusk, ___ a substance to repel predators such as the spiny lobster. This compound ____ the lobsters’ sense of taste and smell, making it difficult for them to identify the sea hare as food.

1. emits…devalues
2. contains…recedes
3. secretes…diminishes
4. conceals…enhances