The calvin cycle: a).was named after an american biochemist b).does not require light energy to work c).produces glucose and water d). all of the above

i would say

D.) all of the above

Explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.