Which of the following statements about enzymes is correct? A. They are destroyed by temperatures below 10 °C.
B. They are changed by the chemical reactions they control.
C. They are all proteins.
D. They are found only in the alimentary canal.

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?