An enzyme increases the rate of a reaction through formation of an enzyme-substrate complex, which

raises the initial energy of the reactants

lowers the final energy of the products

lowers the activation energy

raises the activation energy

i think   the answer is c hope i'm right

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.