So, imagine you had some substance in a bowl. The bowl has a little wall going through the middle, with no openings or anything.
On one side of the wall, there are 100 molecules of the supstance. On the other, there are 10 molecules.
Now, imagine that you make an opening in that little wall that separates the substance into two parts.
Normally, the 100 molecules would start pouring into the part with 10 molecules, or “go down the concentration gradient”, which means going from the part with higher concentration into lower until they are equal.
Going /against/ the concentration gradient is just the opposite — if the 10 molecules went into the side with 100, which takes energy to do.
I think it was germany and they gained an alliance right before ww1
The best answer is "was not part of the Eastern Bloc",
although this answer is misleading.
Yugoslavia was indeed part of the Eastern Bloc in the sense that it was an Eastern European communist country, but it was the only one that did not align itself with the USSR after 1948. It also did no ally with the United States, choosing non-alignment instead.
This answer is the best answer simply because it is less false than the other answers, which are completely wrong. Yugoslavia never joined the USSR, choosing to split from Stalin in 1948, and never became a satellite nation of the US, and isn't located anywhere near the Baltic.
