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

Ex Input:
The properties of the alkali metals are similar to each other as expected for elements in the same family.

Ex Output:
The properties of the alkali metals are similar to each other as expected for elements in the same what?

Ex Input:
The human eye detect can detect three colors of light.

Ex Output:
How many colors of light can the human eye detect?

Ex Input:
Certain characteristics are frequently inherited together because of linkage.

Ex Output:
Certain characteristics are frequently inherited together because of what?