History

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Across
  1. 3. - It is when a species of animal or plant disappears forever.
  2. 9. -A process of becoming fossils
  3. 10. The oldest era, which means ancient life
  4. 11. A super big land where all the continents were joined together a long timeUnicellular organisms are the smallest part of life and live inside of us.
Down
  1. 1. Are living things that have many cells.
  2. 2. Is a living things that consist of only one cell.
  3. 4. period when trilobites appeared
  4. 5. period when jawless fish appeared
  5. 6. The age of the dinosaurs
  6. 7. the hard remains or marks of plants and animals from long ago.
  7. 8. The age of the mammals