what is DDT? - DDT is a pesticide , Why is there less male species in fish? - they absorb hormones that were mixed up in the waterways , In what non-biodegradable plastics affect the nature? - non biodegradable plastics accumulate in nature and contaminate our oceans , rivers , and lands , How does the process of eutrophication starts? - When humans release feaces or urine or when people put fertilizers in plants, what can obtain the chemical waste ? - heavy metals cadmium or mercury ,

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