まなびクマ
Hello there! I am Manabi-Kuma!
Did you know that every big tree you see is mostly made of ghosts? It sounds spooky, but it is actually a wonderful secret of nature kuma!
Long ago, plants were tiny like moss on the ground. They fought a big battle to get closer to the sun. To win, they invented something called Lignin. Think of Lignin as nature's version of super-strong concrete. It allowed them to grow tall without falling over! This was the start of the first trees 385 million years ago kuma!
Inside a tree, there is a very busy factory called the Cambium. It is a tiny, paper-thin layer that makes new cells. The cells that grow toward the inside go on a 'conveyor belt of death.' They become hard like bones, hollow themselves out, and then they die. These dead tubes are what we call wood! Year after year, these skeletons pile up to make the tree thicker and stronger. Isn't it amazing how they build their bodies from their own past kuma?
But how does a tree drink water that is 100 meters high? It does not have a pump like a machine. Instead, water molecules act like tiny magnets that stick together! The sun heats the leaves, causing water to evaporate. This pull acts like a long, invisible rope made of water molecules. It pulls the whole line of water all the way up from the roots. The pressure inside is so strong it would crush a human, but the tree handles it easily kuma!
Just outside the wood is a very thin living layer called the Phloem. This is the tree's delivery service. It carries sugar 'lunches' from the leaves down to the roots. It also sends messages so the whole tree knows if it is hurt or hungry. This layer is very delicate. That is why we must never peel the bark off a tree! If the Phloem is hurt, the tree cannot eat kuma!
Because they are mostly made of dead structural parts, trees do not age the same way we do. They can keep growing as long as they have water and light. Some trees are even 5,000 years old! They were babies when people were building the pyramids in Egypt. If we protect their thin living layer and the environment around them, they are practically immortal. Let's be very kind to our giant green friends kuma!