Question: Which of the following is true about the marker SSP pathways? Need Assignment Help? Question options: They represent the mean timeseries values for each SSP narrative scenario. They ensure that all of the projected emission timeseries values are somewhere in the mid-range without any extreme cases. They have to agree with the outputs from physics-based global climate models (GCMs) in terms of greenhouse gas emissions. They are used as input forcing in running the physics-based global climate models (GCMs).