Which additional observation would support the conclusion that the deer population is NOT changing size from year to year, meaning that the net population change is 0? A. About 20 deer per year immigrate to the tract of forest. B. About 20 deer per year emigrate from the tract of forest. C. The average life span of a member of the deer population is 20 years. D. If a deer survives its first year of life, its average life span is 20 years.

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 .. .

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