Given a scientific question, generate a correct answer to it.

Ex Input:
What is the first direct action of growth hormone?

Ex Output:
stimulation of triglyceride breakdown

Ex Input:
Radioisotopes may vary greatly in their rate of decay, decaying faster if their nuclei are more what?

Ex Output:
unstable

Ex Input:
Vertebrates have evolved more complex digestive systems, with some species having multi-chambered types of what organ?

Ex Output:
stomach