The number of species has increased through time, although not at a constant rate. Five major extinction events have substantially, although briefly, reduced the number of species. Diversity rebounds, but the recovery is not rapid, and the groups making up that diversity are not the same as those that existed before the extinction event. Unfortunately, humans are causing a sixth mass extinction event. In what ways is the current mass extinction event different from those that have occurred in the past

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 .. .

i think the answer is g1

hope i

-lavira: )

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?