In the mid-1980s an aggressive strain of algae known as Caulerpa was accidentally introduced into the Mediterranean Sea when a seaside aquarium cleaned out its tanks. The algae contains a toxin that prevents native herbivores from consuming it. Caulerpa quickly spread over the sea floor, crowding out many species including sponges, corals, sea fans, and lobsters. Which statement explains the most likely impact Caulerpa has had on the biodiversity in the Mediterranean Sea? The presence of Caulerpa within an ecosystem is an indicator of the ecosystem’s health. The spread of Caulerpa improved the habitat for many species of sea grasses, and increased the biodiversity. Caulerpa interbred with native species with the same adaptations within the ecosystem. Caulerpa became dominant within the ecosystem and reduced the biodiversity.