Calcium is what deals with bone growth
Very simple. You can't renew it. Which one of the options seem like you cannot renew the resource in a reasonable amount of time?<span />
Sensory receptors?? I believe that is the answer but you may have wanted a more in depth explanation, if so, my bad.
Answer:
Human glucocebrosidase is used as a therapeutic drug which is used to treat Gaucher's disease.
The farming of this substances in crops is very helpful for the population. The genetic engineering to insert genes in plants would result in GMOs.
It is more beneficial to use plants for this process as compared to that of animals because it is easily available and easily extracted.
It is more economical and easily accessible by people. It would not harm animals by incorporating the gene in them in laboratory conditions.