martes, 11 de julio de 2017
domingo, 2 de julio de 2017
OUR BODY
ACROSS
2. We need them to breathe in air
5. Organelles only plant cells have
6. When the walls of arteries expand and contract to the rythm of the heart
DOWN
1. Muscle that is part of the respiratory system
3. It is the center of a cell
4. A group of similar cells
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