The Biosphere and Atmosphere are interacting because the dolphin (Biosphere) breathes air (Atmosphere) the the Biosphere needs the Atmosphere to survive. The second interactment is the Biosphere and the Hydrosphere, the interactment is the Biosphere is swimming through the Hydrosphere. The Biosphere needs the Hydrosphere because the Hydrosphere is the Biospheres home.
The Biosphere and the Geosphere are interacting because the trees (Biosphere) is rooted to the ground (Geosphere). The Biosphere needs the Geosphere because the Biosphere needs to stay rooted to the ground so it can soak up water to survive. The second interactment is the Biosphere and the Atmosphere. The interactment is the Biosphere breathes the Atmosphere. The Biosphere needs the atmosphere to survive.