Answer:
Elements that are the border line of metals and non-metals.some elements near the stepped line have mixed properties of metals and non-metals these elements are called metalloid e.g. Silicon and Germanium
Explanation:
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Replication of the nucleus.
Heart Blood vessels. (Arteries, Capillaries, and Veins)
The CNS involves the brain and spinal cord and the PNS involves the body nerves.