Every day, a certain farm that raises freshwater fish generates several thousand liters of waste water, which is discharged into a nearby river and replaced with fresh water from further upstream. explain why this process is not sustainable. describe a more sustainable process for handling waste water.

The process is not sustainable because by polluting the streams and freshwater lakes can badly cripple whole ecosystems by killing certain type of fish or anything that lives in the waste. So a more efficient process in my opinion  would probably be to use the waste as a compost of some sort because fish waste has a bunch on nitrates in it which in fact would be really good to put in soil or even water plants with.

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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 sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.