$A$ biosphere is composed of

  • A
    Living organisms
  • B
    Living organisms + lithosphere
  • C
    Living organisms + lithosphere + atmosphere
  • D
    Living organisms + lithosphere + atmosphere + hydrosphere

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How is chemistry related to the environment? Describe it.

Biochemical oxygen demand $(BOD)$ value can be a measure of water pollution caused by organic matter. Which of the following statements is correct?

$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:

Biochemical Oxygen Demand,$(BOD)$ is a measure of organic material present in water. $BOD$ value less than $5 \ ppm$ indicates a water sample to be ..... .

If water pollution continues at its present rate,it will eventually

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