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

Plant nutrition is the study of the chemical elements necessary for plant growth.
What is the study of the chemical elements necessary for plant growth called?

Potential energy type of energy is possessed by autumn leaves before they fall.
What type of energy is possessed by autumn leaves before they fall?

Adult humans lack some of the defining traits of chordates.
Who lack some of the defining traits of chordates?