What is meant by the reference to the earth being an "isolated" planet?

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?

What are some characteristics of a free enterprise economy?

Explain why ecosystem diversity results in species diversity in a healthy biosphere