State two features of diffusion that do not apply to active transport

What enzyme is most important for dna replication and why?

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).