25 POINTS The atom is the basic building block of all matter: The idea that matter was made of tiny separate pieces had been around for many years, but it was John Dalton who wrote the first complete theory about atoms in the early 1800’s. Dalton thought the elements were made of atoms, and diff elements had their own type of atom. It wasn’t until the 1900’s, however, that scientists were able to find proof of the atom. What was Dalton missing from his explanation of atoms that all science explanations needed?

A description of how atoms form

Evidence to support his explanation

Models of atoms to show other scientists

A hypothesis to explain his interpretations

B) Evidence to support his explanation

thymine. in rna, thymine is replace by uracil

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 .. .