Kelly is listening intently to her friend, sheri, talk about her boyfriend who is leaving for a year to serve in the army. kelly says "mmm-hmm" during the conversation to show sheri that she is listening. she is communicating using

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

This refers to weather and atmospheric conditions measured over a long period of time.

What words in the preamble to the constitution reflect the principle of popular sovereignty