The principle difference between point source and nonpoint source water pollution is a. whether the pollution is organic or inorganic b. the number of sources of pollution c. the amount of pollution d. whether it is from commercial or agricultural sources

 b. the number of sources of pollution

The point source pollution can be defined as the pollution whose source of origin can be traced back and the further pollution can be prevented. For example sewage drainage in the pond. The non-point source pollution is the one whose source of origin can be many and cannot be traced back to a single source. For example rain water causing surface runoff which is transferring pesticides, organic matter, sewage water in the water body.

The principle difference between point source and nonpoint source water pollution is the number of sources of pollution. In the point source pollution the number of sources of pollution can be determined and traced back whereas in the nonpoint source pollution number of sources of pollution remains undetermined.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.