Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Blood is made up of red blood cells, white blood cells, platelets, and plasma.
[A]: Blood is made up of red blood cells, white blood cells, platelets, and what else?


[Q]: Phospholipids are vesicles made of.
[A]: What are vesicles made of?


[Q]: Natural resource type of resource is limited in supply and cannot be replaced except over millions of years.
[A]:
What type of resource is limited in supply and cannot be replaced except over millions of years?