What has caused the monarch butterfly population to decrease by 90% over the past 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 .. .

answer; /// i do believe its (heredity); good luck

i use alot when i f my girlfriend. i'm doing her in the bathroom at summer school. shes getting her tight jeans off and then we'll begin

explanation:

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!