Chen drew a diagram to compare the ways in which different organisms obtain nitrogen.

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

What happens when two nitrogen atoms share electrons