Why do molecules form themselves in a particular way?

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?

If 15 drops of ethanol from a medical dropper weight 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? the density of ethanol is 0.80g/ml

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold