Your digestive tract contains several different organs.
Each organ has its own function and its own microbes.
Click on the dots
to find out more!
Want to see how varying nutrients and sunlight will affect the microbe layers? Create more columns with these different conditions and compare the results.
egg yolk + newspaper
egg yolk only
place the column in a brightly lit place, so it experiences both day and night cycles
place the column under a desk lamp all day and all night
place the column in a dark place, like a closet, so it does not experience light
mud from a pond, rain puddle, or riverbed
a different source of mud, sand, or soil
a third source of mud, sand, or soil