Pia mater (soft inner layer of the dural membrane system) The pia mater, which contains vessels, is the innermost layer of the three meningeal membranes. ... Furthermore, it creates the choroid plexus, a network of bold vessels, which enter the brain ventricles and produce the cerebrospinal fluid (CSF).
Nitrogen is released to the abiotic parts of the biosphere from the process death and by bacteria.
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It depends on the disease. some disease like coronavirus spreads through spit or sneezing on someone. Other diseases like diabetes or cancer are spread genetically. Other diseases can be spread through germs or even airborne.
