Cell theory and types of cells

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Across
  1. 4. Living things that are made of only one cell are called ____________.
  2. 5. The oldest and smallest type of cell.
  3. 8. Bacteria, archaea and eukarya, are all examples of organism ___________.
  4. 9. There are ________ main principles of the cell theory.
Down
  1. 1. These cells have organelles and a nucleus.
  2. 2. Cells can be observed using a _____________.
  3. 3. Humans and animals are examples of ___________ organisms.
  4. 6. Bacteria, archaea, protista, fungi, plantae and animalia are all examples of _____________.
  5. 7. The ability to maintain steady internal conditions.