You have a tube of nutrient broth, in which E. coli is growing. Upon analyzing the broth chemistry, you find: oxygen content has dropped a bit, but carbon dioxide has gone up a lot formic, acetic, and lactic acids are present What kind of metabolism has most likely occurred

Fermentation

Explanation:

A metabolic process in which an organism breaks down glucose to produce carbon dioxide and ATP in absence of oxygen.Other than carbon dioxide and  ATP fermentation produces lactic acid, ethyl alcohol etc.

A drop in oxygen concentration and rise in Carbon dioxide levels with the presence of Formic ,acetic and lactic acid signifies that the metabolism which has occurred is Fermentation.

It's a

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.