General Knowledge Ecology and Environment Ecology and Functions of an ecosystem

ହ୍ରଦରେ ସୁପୋଷଣ ଉପସ୍ଥିତି ହେତୁ ହୋଇଥାଏ

1
DO ଏବଂ ଜୀବାଣୁ
2
ନାଇଟ୍ରୋଜେନ ଏବଂ ଫସଫରସ୍
3
BOD ଏବଂ COD
4
କ୍ରୋମିୟମ ଏବଂ ପାରଦ
5
ଉପରୋକ୍ତ ମଧ୍ୟରୁ କୌଣସିଟି ନୁହେଁ

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