The alerting system is part of the reticular activating system. It consists of the brain nucleus known as and its projections throughout the brain.
A. Locus coeruleus.
B. Von Economo nucleus.
C. Substantia nigra.
D. Caudate nucleus.

The answer is A.

Explanation:

The alerting system which is a part of the reticular activating system that provides the consciousness for us using the connections between the brain stem, cerebrum etc. consists of Locus Coeruleus which are nucleus located in the brain that responds to psychological stimuli such as panic, stress or discomfort. So the answer is A.

I hope this answer helps.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

option number one would be youre best option