Weegy: After chlorofluorocarbons were banned, Hydrofluorocarbons was used in their place. User: During the Carboniferous. Plants and animals grew very large due to high concentrations of Weegy: During the Carboniferous period, plants and animals grew very large due to high concentration of oxygen in the atmosphere. User: Why is the horseshoe crab an example of a living fossil Weegy: The horseshoe crab is an example of a living fossil because it hasn't changed since it first appeared on Earth. User: Except for solar cells and hydrokinetic buoys which do all power generated technologies used to generate electricity Weegy: Except for solar cells and hydrokinetic buoys, all power-generation technologies use a turbine to generate electricity. User: Which extinction event is possible for wiping out non-avian dinosaurs Weegy: The Cretaceous-Paleogene extinction is responsible for wiping out non-avian dinosaurs. User: What's responsible for causing eutrophicationn in waterways Weegy: Runoff of artificial fertilizers is responsible for eutrophication in waterways. User: How does the hydroelectric dam pictured here impact the environment Weegy: The hydroelectric dam pictured here impacts the environment: By blocking fish migration. User: Which processes cause thick sediment layers to accumulate along the boundaries of a continent Weegy: Subduction causes thick sediment layer to accumulate along the boundaries of continental and oceanic plates. User: Ozone in the upper atmosphere has been depleted by Weegy: Ozone in the upper atmosphere has been depleted by chlorofluorocarbons. User: been depleted by (More)