The nervous system:
works with the endocrine system to maintain homeostasis.
communicates with the body via action potentials (nerve impulses).
is responsible for perceptions and behaviors.
initiates voluntary movements.
all of these are correct.

All of these are correct.

Explanation:

Nervous system is the complex network of the nerves that carries the information in the body. Nervous system mainly consists of large numbers of millions of neurons.

The nervous system perform different functions in the body. The communication of the nervous system occurs by the transmission of nerve impulse. The voluntary and  involuntary actions of the body are controlled by the nervous system. The behavior and perception of the organism is controlled by nervous system. The endocrine system also depend on the nervous system and maintains the homeostasis of the body.

Thus, the correct answer is option (5).

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.