Which statement best describes how a catalyst can speed up a chemical reaction? The catalyst decreases the activation energy needed.
O The catalyst increases the concentration of products.
The catalyst binds to enzymes to release substrates.
O The catalyst increases the concentration of reactants.

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

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?