You and your family have planned a weekend retreat at a lakeside campground. Upon arrival, you notice a Department of Health sign indicating the presence of fecal coliform bacteria in the lake. As an environmental science student you know toa. warn your family that fecal coliform bacteria is an indication of harmful microorganisms in the water. b. tell your family that fecal coliform bacteria is a group of harmless microorganisms, and swimming is safe. c. tell your family that the presence of fecal coliform bacteria means that swimming is safe, but the water must be purified before drinking .d. tell your family that the water is safe because fecal coliform bacteria indicates low biochemical oxygen demand. e. tell your family not to get close to the water, because fecal coliform bacteria is a leading cause of bacterial infections in the human digestive system

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

Why is a dominant allele called dominant

Sea levels are rising due to climate change while increasing numbers of people are moving into coastal areas. to accommodate more people, there has been increased construction of beachfront resorts and condominiums. how is this impacting sea turtle numbers and biodiversity and why? a. the increased human population in coastal areas has meant that more food is available to the turtles (e.g., dropped food, waste from restaurants), which has led to an increase in the numbers and diversity of sea turtles. b. there has been very little change in the numbers and biodiversity of sea turtles because the planet is so vast that they can simply relocate to less crowded beaches. c. this has resulted in a decrease in numbers and diversity of sea turtles because it is restricting available nesting sites, and hence reproduction. d. this has resulted in an increase in numbers and diversity of sea turtles because people are around to protect them from natural predators.