You plant one acorn in a forest and a second acorn in an open field. After 20 years, the oak tree in the forest is tall and thin, whereas the oak tree in the field is shorter, thicker, and has a broad crown. What is the most likely explanation for this outcome?

Because of phototropism.

Explanation:

Phototropsim can be described as the action / movements of any plant, while growing or later, towards or according to the position of the sun. The oak tree that was planted in the forest needed to grow taller to be able to get the sunlight it needs among other trees so in the end it is taller and therefore thinner. Whereas the oak tree that was planted in the open field had direct access to the sunlight it needed and it grew as shorter and therefore thicker.

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