Question

How does a whale fall community affect ocean sediment?
The decomposition of the whale enriches the sediment.
The remains of the whale pollute the sediment.
The sediment is transformed into food for mussels and crabs.
The bacteria that are attracted break down the sediment nearby.

Answer 1

Best answer: The decomposition of the whale enriches the sediment.

Why: when a whale carcass falls to the seafloor it releases a huge pulse of organic matter and nutrients into the surrounding sediment and water. Microbes rapidly decompose that organic matter, producing sulfides and other reduced compounds that enrich and chemically change nearby sediments and fuel chemosynthetic bacteria. Those bacteria and the enriched organic material then support scavengers and seep-like communities (mussels, clams, Osedax worms, crabs, etc.).

Why the other choices are misleading:
- “The remains of the whale pollute the sediment.” — Not the right framing. The carcass causes a local, natural enrichment and chemical change; it can produce toxic sulfides locally, but it is an ecological hotspot rather than generic “pollution.”
- “The sediment is transformed into food for mussels and crabs.” — More accurate to say the whale’s organic matter enriches the sediment and food supply; the sediment itself (minerals) isn’t transformed into food.
- “The bacteria that are attracted break down the sediment nearby.” — Bacteria break down the whale’s organic matter (and organic material in the sediment), not the mineral sediment itself.