Fill in a word that correctly completes the paragraph.
Carlos learns that all living things have cells with the same system of genetic material. Scientists have concluded that this shows that all living things had a common ancestor.
This common ancestor, called ................, was most likely a single-celled organism.
it's called Luca single-cell organism known as Last Universal Common Ancestor or Luca. And it could help establish how life on Earth began, at the very star
