States that for undisturbed rocks, the oldest rocks are on the bottom and the rocks become younger and younger toward the top

Iguanas need to live in a habitat that is very warm, so the pet store warms their enclosures with "basking lights" which act as an artificial sun. describe how the three methods of thermal energy transfer may take place within the iguana's enclosure.

What causes darkening of the skin as melanin production increases

What is the similarities and differences between bacteria and eukaryote?