Annual Rings in a Tree Trunk Result from

question 26

Multiple Choice

Annual rings in a tree trunk result from

• A)deposition of colored materials in the oldest cells.
• B)the variation in cell size due to different growth conditions throughout a year.
• C)the alternation of xylem and phloem produced in one year.
• D)the kinds of cells,parenchyma or sclerenchyma,produced by the cambium.
• E)the proportion of wood cells and cork cells in the xylem.

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Cancer

A broad group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body.

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A variety of illnesses affecting the lungs, leading to decreased ability to breathe and other associated health problems.

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