Why is this the answer?

The answer is tree because this amazing riddle is telling the life story of one of the largest and most helpful things on our planet. It uses clever little word puzzles to describe all the different parts of a tree and what we use them for every single day. Let us be detectives and look at the clues one by one to see how they all point to a tree. The first part says, "Some live in me, some live on." Think about a big tree you see in the park or in your yard. Birds build their soft nests right inside the branches to keep safe, and little squirrels might even make a cozy home inside a hole in the trunk. That is living "in me." And all sorts of tiny creatures, like busy bugs and ladybugs, walk right "on" the rough bark and the green leaves. A tree is a giant apartment building for many animals in nature. The next important clue is, "And some shave me to stride upon." This is a little tricky. When people need to use the strong wood from a big tree, they cut or "shave" it into smooth, flat boards to build things. A carpenter might use these boards to create the wooden floor in your house or a wooden deck outside. When you walk across that floor or path, you are "striding upon" the tree's wood, which was given a wonderful new purpose. The clue, "I rarely leave my native land. Until my death I always stand," is very easy to solve. Trees grow from a tiny seed in one spot, and they stay right there forever and ever. They never get up and walk around, so they stand perfectly still until the very end of their life. Their native land is the soil where they first grew, and they never move away from it. Finally, the last clue gives us the perfect picture of the whole object: "High and low I may be found. Both above and below ground." Think about how tall a tree is. Its green branches and strong trunk reach way up "high" into the sky and sunshine. But the important roots go deep down "below ground" to find food and drink up water. A tree is perfectly balanced, found both high in the air and low in the earth at the same time.