जमीनी स्तर पर स्वच्छ शुष्क हवा का संघटन (प्रमुख गैसें) आयतन के अनुसार लगभग कितना होता है?

Prolonged exposure to extreme cold temperatures may result in tissue damage known as frostbite, which is categorized as a:

In the context of ecosystem energy dynamics, which of the following expressions correctly defines Net Primary Productivity (NPP)?