Biomass fuel = <span>fuels derived from living things (renewable resources)</span>
Enzymes serve to speed up reactions by lowering the energy of activation, the amount of energy needed to begin a reaction.
I don’t quite understand what your asking but if your asking if it’s a mystery then no it isn’t but if this was not the answer you were looking for I suggest you put it another way that makes more sense
Answer:
Explanation:1. Fossil and other evidence indicates that the first major innovation in hominid evolution was: ______
a. increased brain size b. tool making c. material culture d. bipedal locomotion