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

In machines that increase force, such as ramps and doorknobs and nutcrackers, output is greater is the relation between output and input force.
In machines that increase force, such as ramps and doorknobs and nutcrackers, what is the relation between output and input force?

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?

Aquatic biomes are determined mainly by distance from shore and depth of water other factor.
Aquatic biomes are determined mainly by distance from shore and what other factor?