<span>"they form a cyst: a hard covering is formed around the protozoan and metabolic rate is slowed"</span>
Answer:
1
Explanation:
cardiovascular and respiratory
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.
It's the pull of gravity on an object.
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