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All cells are surrounded by a ____ _____ that controls the materials that move in and out of the cell.
The tiny power plants in the cell where food is broken down and energy is released are called _______________.
A green structure called a ________ uses the energy from the Sun to produce food for the plant.
In the 1940s, ______ microscopes were created that were 40,000 times more powerful than previous microscopes.
In the salamander, the organ system that breaks down food for the energy is the ______ system.
bones, muscles, and brain
What are the parts of the organ systsems that control movement and responses?
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