When John begins to run, his muscles utilize oxygen and produce carbon dioxide. His body has receptors monitoring these conditions. When the levels stimulate a receptor, the heart rate and respiratory rate elevate to accommodate the change. This is an example of a reflex.

How do you think earths interior affects what is happening on the surface? 2. how do fossils support the continental drift hypothesis? 3. how does sea- floor spreading support the hypothesis of continental drift? 4.what do scientists observe when they studied the magnetic fields of rocks on the sides of mid-ocean ridges? 5. what is a tectonic plate ? 6. explain mantle convection 7.how can movements of the continents affect earths climate? 8. what occurs during drifting?