निम्नलिखित विकल्पों में से कौन-सा एक स्थिर (लेंटिक) मीठे पानी के पारिस्थितिकी तंत्र का उदाहरण है?

The transition zone between two distinct ecosystems is known as a/an:

The transitional zones or boundary regions between two diverse ecological communities are called:

The transition zone between two distinct ecosystems is referred to as: