Which describes a difference between cephalopods and gastropods? A) Cephalopods have a water vascular system, and gastropods have an open circulatory system.
B) Cephalopods live only in ocean environments, and gastropods live in a variety of environments.
C) Cephalopods have a simple nervous system, and gastropods have a complex nervous system.
D) Cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

c. live where it’s cold and icy

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

the answer is c. it will give up it's valence electron to the other atom.