The system of science as the fourth level of the world view should be understood here as a process of gaining knowledge. The basic prerequisites for knowledge are consciousness, language, and interaction. The requirements for entering this level are listed in the described order. This could suggest that the one builds on the other. But, the one cannot be thought of without the other. So the question arises whether consciousness is possible without interaction or whether consciousness is already required for interaction. Intuitively it is undisputed that language presupposes consciousness. But the relationship between language and interaction is indecisive again: language requires interaction - otherwise it could not arise - and (intellectual) interaction is inconceivable without language. Interaction comes third, because knowledge can only be created with the help of a complex interplay of numerous scientific disciplines in order to create a world worth living. Thus consciousness symbolized by the brain is the origin of knowledge; language is needed to generate and formulate ideas; interaction helps to critically constructively validate and communicate theses.
What is consciousness?
Wikipedia: "Consciousness at its simplest is 'sentience or awareness of internal or external existence'."