In a Bio207 lab you determine that the cost of transport for two fish from different species is 1 kJ/km for fish one, and 10 kJ/km for fish two. Provide an estimate of the swimming speed of each fish assuming that a) both fish have the same metabolic rate; b) fish two has a metabolic rate 10 times higher than the metabolic rate of fish one; and c) fish one has a metabolic rate that is 100 times smaller than the metabolic rate of fish two. Note that the ratio of metabolic rate to speed defines the cost of transport in units of energy/distance

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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it’s lava came from an explosive eruption

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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