1.)A scientist discovers that 10% of the base pairs in a strand of DNA are guanine. Based on this information, what percentage of the base pairs are thymine? 2.)Describe what happens during the synthesis (S) phase of the cell cycle in terms of what we learned about in this unit.

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?