21 IS ANSWER PLZ GIVE BRAINLYIST I NEED TO LEVEL UP
Answer: OK so The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain parenchyma. The ventricular system is composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct, and the fourth ventricle (see the images below).Survival in untreated hydrocephalus is poor. Approximately, 50% of the affected patients die before three years of age and approximately 80% die before reaching adulthood. Treatment markedly improves the outcome for hydrocephalus not associated with tumors, with 89% and 95% survival in two case studies
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Explanation:
Multi-cellular Heterotrophs
Animals have more than one cell and can't produce their own food
The respiratory system works directly with the circulatory system to provide oxygen to the body. Oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen-rich blood to tissues and cells.
Parasympathetic nervous
Parasympathetic nervous
system is known to be one of the two divisions of the autonomic nervous system
and it is responsible for the stimulation of rest and digest activities that
usually occur when the body is at rest after eating which includes salivation,
urination, sexual arousal and digestion.