Using at least 10 of your vocabulary words. Make an observation in your backyard ecosystem. Then describe the community of organisms that you have living in the ecosystem. Which biotic and abiotic factors are contributing to your ecosystem? Please Underline your vocabulary words. Be creative. You can also illustrate if you like. Do you have any food web’s or food chains?

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.

hope this .. .

correct answer is a. and d.

what is the statement?