Assuming the options are: (Thalamus)
brain stem
thalamus
cerebrum
hippocampus
The thalamus is a large mass of gray matter in the dorsal part of the diencephalon of the brain with several functions such as relaying of sensory signals, including motor signals to the cerebral cortex, and the regulation of consciousness, sleep, and alertness.
Answer:
have an open circlitory system
Explanation:
Answer: A bond in which electrons are shared.
