3. If metabolism is chemical reactions-- what is the difference between "chemistry soup" in a beaker and biochemistry in a living cell? Define the "energy problem" that all chemical reactions present, then discuss the two molecules that cells use to solve that problem. Describe the process of how these two molecules work: that is, in addition to saying what they "do", be sure to include specific information about how it happens. It should be clear how the structure of these two molecules is important to getting their jobs done.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

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human impact on the environment can be seen in the deterioration of the !

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