What mechanisms humans maintain homeostasis when they are in a cold environment?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because