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

A(n) gastropods is noted for having its eyes at the tips of stalks or tentacles that emerge from its head.
What type of creature is noted for having its eyes at the tips of stalks or tentacles that emerge from its head?

Gravity makes soil and rock particles move gradually down the slope during each thaw.
What makes soil and rock particles move gradually down the slope during each thaw?

Platelets blood component serves both structural and molecular functions in blood clotting.

What blood component serves both structural and molecular functions in blood clotting?