Final answer:
Plastics can break down into smaller pieces but do no biodegrade. They can accumulate in ocean gyres and attract toxic chemicals.
Step-by-step explanation:
All of the statements provided are true except for a. Plastic may break down to smaller and smaller pieces, but it does not biodegrade and disappear. Plastics are not readily biodegradable, especially under the anaerobic conditions of landfills. They tend to accumulate and persist in the environment, particularly in areas with swirling currents, like the central Pacific gyre. Plastic pellets can also attract hydrophobic and toxic chemicals. Therefore, the correct answer is option a.