वृक्क निवाहिका तंत्र (Renal portal system) निम्नलिखित में से किस प्राणी समूह में अनुपस्थित होता है?

What term describes animals that regulate their body temperature internally through metabolic heat?

In the context of marine and aquatic ecosystems, how is the phenomenon of bioluminescence precisely defined?

What is the average heartbeat rate per minute of a Coal Tit bird during active state?