किसी विशेष क्षेत्र या काल की समस्त पादप जनसंख्या (पौधों) को सामूहिक रूप से क्या कहा जाता है?

How does thermal pollution affect the metabolism of aquatic animals?

From the second half of the 20th century, what has been the primary cause of the dramatic fall in the black rhinoceros population?

Genetically unique black rhinoceros populations have been lost in several African countries due to local extinctions. In which of the following countries does the species still survive?