Which of the following is a potential impact of microplastics on marine life?

Microplastics can have a significant impact on marine life, particularly through mechanisms such as gut blockage and altered feeding behavior. When marine organisms, such as fish and shellfish, ingest microplastics—often mistaking them for food—they can experience physical blockages in their digestive systems. This blockage can lead to malnutrition or starvation, as the animals may be unable to properly digest their food. Furthermore, the presence of microplastics can alter the feeding behavior of these organisms. For example, they may avoid certain areas where microplastics are abundant or change their feeding habits in ways that could disrupt the balance of the ecosystem.

The other options do not reflect the documented effects of microplastics on marine life. Improved oxygen levels, enhanced growth rates, and increased reproductive success are not associated with the presence of microplastics; rather, research suggests that plastic pollution generally has negative repercussions for ecosystems and the health of marine organisms.