Biology: Age 15
6 illustrated Biology lessons for Age 15.
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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…