Question

how do some cities use bivalves like mussels for water-quality monitoring? bivalves change color when pollutants are present, which is visually scanned when exposed to pollutants, bivalves close their shells and trigger alarms through monitoring systems bivalves emit a chemical marker that is pumped into the municipal supply bivalves produce a specific sound in polluted water detectable by microphones

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Bivalves don't typically change color visibly in response to pollutants for monitoring purposes.
• Option 2: Bivalves (like mussels) have a natural response to environmental stressors (including pollutants) by closing their shells. Monitoring systems can detect this shell - closing behavior and trigger alarms, which is a known method for water - quality monitoring using bivalves.
• Option 3: Bivalves do not emit a chemical marker that is pumped into the municipal supply for water - quality monitoring.
• Option 4: Bivalves do not produce a specific sound in polluted water that is detectable by microphones for water - quality monitoring.

Answer:

B. When exposed to pollutants, bivalves close their shells and trigger alarms through monitoring systems