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

Blood is made up of red blood cells, white blood cells, platelets, and plasma.
Blood is made up of red blood cells, white blood cells, platelets, and what else?

Mechanical waves term describes waves that travel through matter.
What term describes waves that travel through matter?

In naming ternary compounds, the cation is stated first.
In naming ternary compounds, which type of particle is stated first?