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In the ocean, even the largest and most resilient bits of plastic are broken up and degraded by the waves and sunlight until eventually, these chunks measure less than five millimetres across about the size of an ant and they are classed as secondary microplastics. This type of plastic, that started out as drinks bottles, fishing gear, disposable cutlery and so on, is much more abundant than primary microplastics that started out small, such as the microbeads found in toothpaste

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PMID 6961509

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Second-hand smoke linked to pet deaths and illnesses, experts say Published Family pets are equally, if not more, at risk of being affected by passive smoking as humans, research suggests