1. What is the name of the process, where the cells absorb oxygen and nutrients, while getting rid of carbon dioxide and other waste products?
2. What is needed in the body for energy that is formed in the cells?
3. Why are not all cells in the body the same?
4. What is in the cell nuclei of cells?
5. What is the role of genes?
6. Plant cells have strong cell walls. Why do animals with only a thin cell membrane survive around the cells?
7. Fill in the missing words.
a) is the body's smallest building blocks.
b) Cells that are similar to each other together forms one
c) An organ consists of several different ones and together with other organs forms one
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