This is my theory on how A tree is actaully a cow. Now first off we know that cows roam around and eat grass all day, and the occational medium sized rock to help digest there food. A tree on the other hand sits and does nothing, except make food out of air, sun and water. Lets take a closer look at the cow. Now, a cows brain is very small, especially in the female of the species. This is held true for most land based creatures. Now with a brain as small and as incomplex as it is, the cow does nothing (conicedence to the tree, i think now), except eat grass. In the same standpoint the tree does nothing, but instead of grass it eats the ground, further and further, and as far down as it needs to go to get its "food". Both the tree and the cow use air in normal existence, hence another starteling similarity. Also, take note, that both the cow and the tree use water in surviving, and reciprically, could not survive wtihout it. My theory is as follows:

            A cow starts its life as........a cow. Now through its course of life, it becomes bigger and bigger till it is sloughtered. Now sometimes the cattle are missing, why is this?? When a cow finds that there is no more food in the general vicinity of 2 inches, it digs down in the earth to find food. Now when this happens, the ears start to take root. And before long a full blown tree is in the place where a cow used to be. Since its mouth has been changed into a root, the cow/tree needs another source of food. It does this by converting sunlight, air and water into glucose, commonly known as sugar.
Cow=Tree
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