A clique typically has similar backgrounds and interests, so B.
Pb, if compared to Ca it is less reactive and it is a transition metal, and is highly stable alone.
Blue because usually people will think the color of water is blue so it will match/blend more than red or green
Nicolaus Copernicus was the one who brought astronomy out of the dark ages.
In one of his books "On the Revolutions of the Heavenly Bodies", he published the renowned line which declares his theory.
Nicolaus Copernicus, A polish astronomer put forward the theory that the is th Sun one that rests in the middle or center of the Universe and the planet Earth revolves around it on its axis every day.which was considered to be called the Heliocentric system.
To know more about the Heliocentric system refer to the link brainly.com/question/3491738?referrer=searchResults.
To know about Sir Nicolaus Copernicus' work refer to the link brainly.com/question/6699117?referrer=searchResults.
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Yes they do. So if you need to add or subtract a pair, then you have to first change one or the other so that they both have the same power of 10.