1 min to read
It's hard to overstate the importance of trees. Their appearance more than 300 million years ago was a turning point for Earth, helping transform its surface into a bustling utopia for land animals. Puzzle over six amazing photos showcasing the majesty of trees.
Scientists have found that trees can flood their leaves with chemicals called phenolics when insects begin to attack the tree. They can also signal danger to other trees so they can start their own defense. Some have been shown to attract predators and parasites that kill the insects. One study found apple trees under attack by caterpillars release chemicals that attract caterpillar-eating birds.
Play this puzzle with the Pics n Mix app!
Pics n Mix is quick and easy to learn, and the short video below explains everything you need to know.
Just choose a puzzle and click the Play button. Drag and drop the pieces to where you think they should be. If you have chosen "plus rotation" it means some of the pieces are flipped top to bottom or right to left. If you tap a piece once, it will flip from top to bottom. and if you double tap it, it will flip from left to right.