Answer: Oil that is denser will float on the ocean's surface and will have a negative impact on the environment.
Step-by-step explanation:
Oil spill is a phenomena of discharge of oil by the water transport vehicles in the waterbody. It floats over the surface of water or may sink at the bottom. This restricts the supply of oxygen to the water body which results in the decline of the population of aquatic species. Also if the oil sinks at the bottom. It will be consumed by the aquatic organisms which may cause toxicity.
As it is given that the oil is denser because of the presence of volatile toxic compounds. It will sink and consumed by the fishes and other aquatic organisms produces toxicity and death. This will lead to the loss of biodiversity from the ocean hence exert negative impact on the environment.