instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Single-celled organisms and multicellular organisms have this in common: both have a way to get rid of waste materials.
answer:
Which characteristic do single-celled organisms and multicellular organisms have in common?

question:
Salt-water biomes in the ocean are called marine biomes.
answer:
Salt-water biomes in the ocean are called what?

question:
The term half-life decribes the amount of time required for half of the original material to decay in an isotope.
answer:
What term decribes the amount of time required for half of the original material to decay in an isotope?