What happens first at each origin of replication? enzymes eat nucleotides

enzymes unwind DNA

enzymes remove bases

enzymes kill viruses

How does the carbon cycle involve an exchange of carbon

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)