Why aren't mountain ranges and polar ice caps classifies as biomes?

According to the law of conservation of energy, energy can neither be created nor destroyed. if this is true, why is there less energy in the top of the energy pyramid than there is in the bottom of the energy pyramid?

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

20 the compound al(nh3)2 has atoms of nitrogen.