If i would have to make an educated guess, i would say C.
Answer:
Allosteric enzyme
Explanation:
A K system is an allosteric enzyme for which the apparent affinity of the enzyme for its substrate is altered in the presence of effector and for which the apparent Vmax does not change. ... KM is a constant for any enzyme.
Answer:
Metals
Elements that readily lose electrons are all metals. Metals that normally lose one electron all form +1 ions with electron configurations we call “stable,” or “energetically favorable.” Element that are metal tend to loss electrons and became positively charged Ion called cations.
Explanation:
Your letter answer: C
Moon...? idk ;~;... I'm pretty sure the moon is one of the focal points.