Answer:
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Explanation:
Elements in the first row (hydrogen and helium) will have outer electrons in the first energy level. Their principal quantum number is 1. Elements in the second row (lithium through neon) will have valence electrons in the second energy level with a principal quantum number of 2.
Answer: D
Explanation: Lateral leaf growth will start on the plant.
Answer:

The force that blood exerts against the wall of a vessel is called <u>blood </u><u>pressure</u><u>.</u>
Class 10 - NCERT Book - definition.
