Scientists placed 42 sea sponges in a polluted Spanish port. 455 days later, one species had thrived while four others died

Researchers in Spain spent 455 days tracking how sponges from five species of Mediterranean sea life coped with being moved from clean, natural habitats toward a heavily polluted recreational marina near Girona. The experiment was designed to test a restoration approach called renaturalization, in which hardy, naturally occurring species are deliberately introduced into degraded environments to help improve conditions over time.

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