The morphology is an example of convergent evolution.
Convergent evolution refers to the observation that unrelated species can evolve independently to present similar characteristics. The result is that species with different lineage evolve similar structures, forms, organs or in general adaptations. An example could be the fact that insects, bats and birds (even though not related) have similar structures in order to achieve flight.
Leptin
Leptin is a hormone produced by the adipose
tissue of the human body. It is made up of 167 amino acids and it performs its
key role in the regulation of body weight, energy balance and endocrine
function. However, deficiency if leptin and its receptor in human will result in
obesity.
A group of interdependent organs with similar functions is an organ system.
Nondisjunction , I'm think this is the answer but I'm not for sure.
The answer is most likely cellular respiration, but it could possibly be photosynthesis.