A koala maintains a constant internal temperature in both the heat of the day and the cool of night. What is this called? Question 14 options: ectothermy endothermy hydrothermy geothermy PLEASE HELP!!

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.