2. "Our study shows that microplastics are an additional vector for exposing fish to micropollutants like progesterone, a steroid hormone that can be found in the environment," says Florian Breider, the head of EPFL's Central Environmental Laboratory (Technology Networks, 2021).

(a)Select ONE (1) toxicant and explain its sources and endocrine disruptor's characteristics.

(b) Analyse the actions of endocrine disruptors in (a) and their effects on human.