What does increased BOD and COD bring about?

Which does not occur due to increased BOD and COD?

What is BOD?

Whose theory does not propose anything about the positive and negative charges of an atoms.

Which invasive weed is a major cause of biodiversity loss worldwide? What impact does this bring about to the ecosystem?

If the intensity of radiatioin in a photocell is increased how does the stopping potential vary ?

What does higher and lower BOD levels indicate?