कौन सा शब्द उस विशिष्ट प्राकृतिक वातावरण या घर को संदर्भित करता है जहां एक विशेष पौधा या जीव रहता है?

An excess runoff of which fertiliser nutrients most commonly drives eutrophication and algal blooms in lakes and rivers?

The complete absence of fish in a river indicates that the river is:

Which group of organisms helps in the recycling of nutrients in an ecosystem by breaking down organic matter?