Pet plastics are not more environmental hazardoxs substances. Why?

Plastic bottles are formed from a chemical substance ………. .

A bucket made of plastic does not rust like a bucket made of iron. Why?

Plastic articles are available in all possible shapes and sizes. Why?

Assertion :Species with low genetic variability are generally at greater risk of extinction than the species with more genetic variability. Reason: Species with low genetic variability are more vulnerable to disease, predators or other environmental challenges.

Solution in a _______ mixture of two or more substances .