All cells have an outer covering called a

Scientists separate cells into _________ groups.

_____________ are tough, rigid, outer coverings that protect plant cells and give them shape.

Water is able to move freely into and out of the cell through the cell _______________

The _________________ directs all cell activity.

In plant cells, food is made in ___________________.

A cell is the ____________________ unit capable of performing life functions.

Some _____________________ process energy, and others manufacture substances needed by the cell.

The energy in food is stored until it is released by the _____________________.

Cells make their own proteins on structures called ________________.

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