Select the correct statement about the regulation of gastric secretion.
a) vagus stimulation of the stomach results in decreased secretion of gastric juice.
b) the presence of food in the stomach prevents hormonal control of gastric secretion.
c) gastric secretion can be stimulated before food has entered the mouth.
d) gastric secretion is enhanced by very low ph (below a ph of 2).

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.