Sure there’s space for one side being conscious and one not being: tell me where the line is. Tell me what does it. Then tell me where the same line is between

Sure there’s space for one side being conscious and one not being: tell me where the line is. Tell me what does it. Then tell me where the same line is between a cluster of cells and an embryo and a baby and an adult. When does consciousness “happen,” and where does it come from?