You probably already know that Earth is a "living entity." But Earth in earlier stages was not that much alive. For example, early in its 4.6 billion-year history, our planet had a very different atmosphere, no biomolecules, no cells, and no life. Then, this sterile and hot Earth started to brew a potion in its primitive oceans through millennials. First, biomolecules such as carbs, fats, and nucleic acids (DNA and RNA) are formed from simple chemical elements. Then, lifeless spheres developed from those biomolecules, but there was no life.
Life appeared in our plane way later than its creation by Earth 3.7 billionth anniversary, as a form of simple cells that evolved from those lifeless spheres I was talking about in the previous paragraph.
Through ages of evolution from biomolecules to micellar spheres, the prokaryotes were the first true living organism to appear on Earth. Prokaryotes are single-cell organisms (bacterias and cyanobacteria), and their cells lack membrane-bound organelles, so no nucleus is present to separate DNA material from the cytoplasm. On the other hand, plants are formed from a different kind of cell; this cell is called Eucaryotic. Eukaryotes evolved after the prokaryotes, and their DNA is more elaborately packaged to fit inside the nucleus.
But, speaking about cells, I also need to say that all living organisms are composed of cells, and cells are the smallest unit of life, which only arise from preexisting cells.
