Which layer of earth has partially melted material that moves the tectonic plates?

How does a gymnosperm prevent itself from pollinating the same tree

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere