Earth's tilt does not stay the same because of its precession.
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ANSWER: The presence of cork cambium depicts that the plant has undergone secondary growth.
EXPLANATION: Cork cambium is also referred to as is also known as Phellogen (a meristematic cell layer). It is found in vascular plants and located in the peridermis.
However, presence of cork cambium indicates that the plant has undergone secondary growth, which is elicited as a result of cell division in the cambia or lateral meristems, which in turn causes the stem and root to thicken.
