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

Zinc is active transition metal kind of metal.
Zinc is what kind of metal.?

The amniotic egg first evolved in reptiles.
The amniotic egg first evolved in what species?

Within the microsporangium, the microspore mother cell divides by meiosis to give rise to four microspores, each of pollen grain will ultimately form this.

Within the microsporangium, the microspore mother cell divides by meiosis to give rise to four microspores, each of which will ultimately form this?