Are the nitrogenous bases just free floating in the nucleus? If so..why are they just floating? And how are they made? Thank you :)

No, they order in sequences of base pairs in DNA

Explanation:

As you know, there are four nucleotides: Adenine, Thiamine, Cytosine, and Guanine. Adenine and guanine are purines, and cytosine and guanine are pyrimidines. You might not know what that means, so just in case purines are longer and pyrimidines are shorter. Therefore, A pairs with T and C with G. These pairings, along with other structural enzymes, build strands of DNA in the nucleus. I hope that helped, if you have more questions just let me know.

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 .. .

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )