Biology: Age 15

6 illustrated Biology lessons for Age 15.

Plants in Ice-Free Pockets During ice ages, glaciers covered most mountain ranges. A few rocky pockets stayed free of ice, and the plants…
Tree family sugar sharing Some trees may share sugars with related seedlings through underground fungal networks. This extra sugar can h…
Gut bacteria at work Gut bacteria break down parts of food that the body cannot digest on its own. This releases nutrients that pas…
Sliding Filament Segment Muscle fibres contain repeating units built from thick and thin protein strands. During contraction, the thin …
Running Heart and Lungs When you run, your leg muscles burn through oxygen and fuel much faster than when you sit still. Your heart be…
One Cell Becomes Two Before a cell divides, it copies every chromosome so there are two matching sets. The sets are pulled to oppos…