Explain why an energy pyramid had only on tertiary consumer at the top of the pyramid, but lots of producer at the bottom of the pyramid?

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

there is none because earth is stationary and flat.