Signal molecules are responsible for regulating the allocation of resources in the body in response of times of stress. What is the approximate percent O2 saturation of hemoglobin in blood vessels returning from liver cells when the concentration of glucagon in the blood is high versus low?

Ithink its false. hope this : )

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes