What nitrogen cycle process is occurring in the root nodules in the illustration?

a.) ammonification
b.) denitrification
c.) fixation
d.) nitrification

d. groundwater flows through the subsoil and deposits minerals.

cytokinin is what stimulates cell division

option d : from a warmer substance to a cooler substance

according to second law of thermodynamic, heat flows from higher to lower temperature region. heat is the transfer of energy from an object at higher temperature to an object at a lower temperature. so energy flows from warmer to colder objects.