- Ecology and Evolution
In this activity, students examine the size and structure of an old growth tree.
Forests are very important for wild animals and humans. Trees are the lungs of our earth—they recycle the carbon dioxide that we breathe out and produce oxygen. A single tree can be the home or habitat for many different wild animals.
An older and larger tree can be a home for even more creatures. The temperate rainforest contains trees that are several hundreds of years old and can grow up to 5 metres in diameter. These trees make up our old growth forests.
Every year in the growing cycle, a tree adds another ring of growth and slowly expands in diameter. Scientists can measure the age of a tree by counting all of the rings, starting at the centre and making their way out towards the bark.