In science, Year 6 have been developing their understanding of living things and their habitats. This has involved learning about different vertebrates, invertebrates, and plants (both deciduous and evergreen). This week, they have been exploring micro-organisms such as yeast—investigating how yeast grows. As the yeast grows, it converts its food (in the form of sugar or starch) into, among other things, carbon dioxide through the process of fermentation. This makes it crucial to the process of baking bread. The carbon dioxide gets trapped in the dough, causing it to rise. Year 6 observed this effect as the carbon dioxide inflated balloons when the gas was trapped.