Toxicological Trivia of October 28, 2015: An estuary is a partly enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea.[ Estuaries form a transition zone between river environments and maritime environments. They are subject both to marine influences—such as tides, waves, and the influx of saline water—and to riverine influences—such as flows of fresh water and sediment. The inflows of both sea water and fresh water provide high levels of nutrients both in the water column and in sediment, making estuaries among the most productive natural habitats in the world. There live in harmony birds, crabs, sharks and dolphins, are a vital source of income for coastal populations.In addition, plant species that make up the marshes provide a natural defense against high tides and storms. However, in Bahia Blanca, this mosaic of biodiversity is losing its amalgam of flavors and colors from the impact of human activity. In a recent paper the presence of worrying levels of heavy metals were found in:a) The eggs of brown oystercatcher;b) Some of their prey, such as crabs and certain sea worms;c) Both previous assertions are correct.

Correct answer: c. Read more in the Spanish article:  Bahía Blanca: niveles preocupantes de metales pesados en los huevos del ostrero pardo