Which of the following have astronomers used to measure the angle between two observed celestial bodies?

a. zenith
b. sextant
c. azimuth
d. compass

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.