Which molecule would be the most affected by limited nitrogen

How does natural selection change thephenotypes within a population over time?

List five ways we are indebted to phytoplankton

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