What is the mass of 5 molecules of water, in grams?

Apart of an ecosystem that can restrict the growth of a population is referred to as

Several billion years ago which gas was the least prevailant in the atmosphere

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