एक स्थिर वन पारिस्थितिकी तंत्र में निम्नलिखित में से कौन सा पारिस्थितिक पिरामिड हमेशा सीधा (upright) होता है?

What is the primary ecological role of decomposers (saprotrophs) in an ecosystem?

Which category of consumers in an ecosystem eats both plant material and animal tissue, with examples including bears and humans?

Which food source primarily characterizes the diet of carnivores within an ecosystem?