Well, the protists are single celled life that are neither animals nor plants. When they developed a symbiosis with the ancestors of chloroplasts, they became primitive plants. When others started congregating, they became primitive animals.<quoted text>
So is plant and animal life from another type of life form? If so please specify what kind and how it (life) crossed the barriers to create all life.
Protists themselves were already much more complex than bacteria. In particular, protists have separate nuclei, mitochondria, and other internal organelles, unlike bacteria.