Why is there a concern about copper smelting plants?

1. They may release lethal quantities of carbon monoxide into environment. 

2. The copper slag can cause the leaching of some heavy metals into the environment.

3. They may release sulphur dioxide as a pollutant.

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'R2 Code of Practices’ constitutes a tool available for promoting the adoption of

Which of the following are detritivores?

1. Earthworms

2. Jellyfish

3. Millipedes

4. Seahorses

5. Woodlice

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In case of which one of the following biogeochemical cycles, the weathering of rocks is the main source of release of nutrient to enter the cycle?