The kidneys secrete an enzyme called renin
I think it might be possible because they took the nucleus from a sheep and put it inside a sheep embryo and it made an exact clone of the sheep.If they could make a nucleus that could handle the DNA of the dinosaurs and have the nucleus function properly and have the embryo grow properly then it might be possible for them to create dinosaurs.
I am guessing an Ecological Relationship as it is dependent on it's environment
Explanation:
NUTRITION AND AGE FACTOR!