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

[Q]: There are three quarks in each proton and neutron.
[A]: How many quarks are in each proton and neutron?

[Q]: Circannual behavioral rhythms are linked to the yearly cycle of seasons.
[A]: What type of behavioral rhythms are linked to the yearly cycle of seasons?

[Q]: Living echinoderms aredivided into five clades.
[A]:
What are living echinoderms divided into five of?