how to ask gender in a linguistics study

A simple MS paint drawing of kirby (in a yellow coat, with lab safety goggles and purple spikey hair) placing a little green stick figure in a beaker. There are three beakers on the table, containing green, red, and blue stick figures)

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A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store