Why is protein synthesis different in prokaryotes and eukaryotes?

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

Which kind of mutation has occurred when the codon for an amino acid is changed to a stop codon? a. a silent mutation b. a missense mutation c. a frameshift mutation d. a nonsense mutation