निम्नलिखित में से कौन-सा यौगिक मुख्य रूप से ओजोन परत के क्षरण के लिए उत्तरदायी 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)?