Why do people living in mongolia might have often attacked china?

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.

The graph shows a student’s data from an investigation about plant growth in five plants of the same type.

The idea that desirable traits can be bred into human beings and undesirable ones can be bred out is known as: