The amount of energy that needs to be absorbed for a chemical reaction to start

The pronunciation aid that determines the stress placed upon a syllable is the

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

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?