Given a scientific question, generate a correct answer to it.

Ex Input:
All animals have specialized types of what basic structures, which can then do different jobs?

Ex Output:
cells

Ex Input:
On the ventral side of the embryonic disc, opposite the amnion, cells in the lower layer of the embryonic disk (the hypoblast) extend into the blastocyst cavity and form this?

Ex Output:
yolk sac

Ex Input:
Type 1 diabetes results in the pancreas not being able to make what ?

Ex Output:
insulin