Sample of water Water from puddle
Sample of Sea
Sample of Fresh water
Answers
Answer:
(1) Pond water refers to a standing body of water. This is usually smaller than a lake and may either be man-made or natural.
Pond water contains a variety of plant and animal life. While some can be seen with the naked eye, others are too small and will require the use of a microscope to be able to properly observe them.
(2) There are many more seas of the world, around 90 depending on strict you are on the definition of a sea.
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The Largest Seas.
Sea Area Connected Ocean
The Bering Sea 884,900 square miles Pacific Ocean
The Gulf of Mexico 615,000 square miles Atlantic
(3) Fresh water is found in glaciers, lakes, reservoirs, ponds, rivers, streams, wetlands and even groundwater. These freshwater habitats are less than 1% of the world's total surface area yet house 10% of all known animals and up to 40% of all known fish species.
Answer:
Explanation:
Biochemical oxygen demand or biological oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic materials present in a given water sample at certain temperature over a specific time period. When BOD levels are high, dissolved oxygen levels decrease because the oxygen that is available in the water is consumed by the bacteria. Hence, the higher the BOD higher the water is polluted.
The BOD value of sample A is 20 mg/L, which is the secondary effluent discharged from a sewage treatment plant.
The BOD value of sample B is 8 mg/L, which is the river water and it is least polluted.
The BOD value of sample C is 400 mg/L, which is untreated sewage water and it is highly polluted water.