Pia mater
<span>Pia mater is a highly vascular tissue that cleaves
firmly to the surface of the brain and spinal cord. Pia mater protects the
central nervous system by nourishing the brain and allowing blood vessels to
pass through it. The inflammation of the pia mater can lead to meningitis</span>
2 then 1 then 3 you're welcome
Answer:
X: Positive gravitropism
Y: Negative gravitropism
Explanation:
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