Which of the following is a discovery that supports the theory that there was once, or may still be, liquid water on planets other than Earth? A.
There are large ponds and lakes present on the surface of Mars.
B.
Life is present on Saturn and Mars, so therefore water must exist on those planets.
C.
Jupiter experiences daily rainfall and has several small rivers.
D.
There are river-like channels and rocks with an eroded appearance on Mars.

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.

Nita is the office manager at a service station. two applicants, max and tim, arrive to interview for the open mechanic's position. max's clothes are dirty, his hair is unwashed, and he doesn't make eye contact when he gives nita his name. tim dresses in clean jeans and a nice shirt, is shaved, and shakes nita's hand when he introduces himself. after the interview, keith the head mechanic, asks nita what she thought. both men have the skill set needed for the position. nita recommends tim. she is responding to her perception of

Arecent challenge to the european union created by a member state is?