Dolphins emit high frequency sounds which bounce off objects in their environment. these reflected sounds them to locate food, predators, and other dolphins. where have human beings used technology in a similar manner?

What is the period of cell life when it is conducting

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?

What is the major difference between a virus and a viroid?