Final answer:
The correct completion for the sentence about the impact of plastic on marine life is 'a) Building.' This reflects how plastics accumulate in the digestive tracts of marine animals.
Step-by-step explanation:
The sentence should be completed with the option that best fits the context of the environmental impact of plastic pollution in the oceans. Hence, the correct choice is a) Building. This option appropriately describes the accumulation of plastics in the digestive systems of marine animals like seagulls and great white sharks.
The sentence therefore reads: 'Plastics inhabit the oceans, building up in the guts of seagulls and great white sharks.' The presence of plastic waste in our oceans is a severe environmental issue with detrimental effects on marine life. Around 40% of plastic is used only once before being discarded, contributing significantly to the pollution problem. Research indicates that marine animals often mistake plastic debris for food, leading to ingestion and accumulation within their bodies, causing harm or even death.