Landfills that are very old, poorly designed, or mismanaged can create a number of harmful environmental consequences such as wind-blown litter, attraction of animals, and generation of liquid

amber has allowed scientists to study dna that has been preserved over millions of years.

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.