From the knowledge i gained about human evolution through the movie we watched in class, i believe homo ergaster's were the most important step in the human evolution process. Homo ergaster were the first step in the human evolution to effectively communicate with one another, due to the greater whiteness in their eyes which led to non verbal communication. the advancement of communication united the pre-human and made them form a community which allowed for growth and progression. Being able to communicate meant that the homo egasters had a sufficient brain to be intuitive and further understand the world around them.