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.

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands