Which structure is altered by emphysema

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one aspect of dna that allows it to accurately store genetic information is the base pairing from chargaff\'s first rule of the four nucleotide bases. if the c content of a dna molecule is 22%, what are the percentages of the remaining bases?

When water freezes, it . contracts expands