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When air is heated up the molecules spread out and move faster, so heat rises because it is less dense than the cooler air around it.
Our elbow bends all the time, we bend it when we pick up things, when we eat, when we do mostly everything. Cows on the other hand dont pick up food with there feet, they use there mouths, and they probably only bend when they are walking.
Answer:
1. it's the cell membrane or just the cell itself
2. it's eukaryotic, I can tell because it's dividing
3. eukarya
