Explanation:

At the heart of it, the main difference is that a product business sells physical, tangible objects, whereas a service business provides value through intangible skills, expertise and time.
A. late diagnosis is the right answer
simple, hope i helped :)
Answer:
1st blank: "acini", 2nd blank: "pancreatic islets or islets of Langerhorns."
Explanation:
Hope my answer has helped you and if not i'm sorry.