To be considered a source of water pollution, the source must include a chemical. true or false?

The given statement is False.

For a source of water pollution the pollutant can be any undesirable substance present in water.

These undesirable substances can be biological, physical or chemical.

Biological substances such as harmful microorganisms or physical substances such as plastic, garbage and other substances present in water can also be considered as the water pollution.

The chemicals, and other substances are considered as the source of water pollution.

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.