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Given the information: ,
,
,
, the number of degrees of freedom that should be used in the pooled-variance t test is:
Root Hairs
Small hair-like structures extending from a plant's root, increasing surface area for water and nutrient absorption.
Epidermis
The outermost layer of cells covering an organism, particularly in plants and animals, serving as a protective barrier against the environment.
Sclereid Cells
Specialized thick-walled plant cells that contribute to the hardness of nuts, seeds, and certain fruits.
Chloroplasts
Organelles found in the cells of green plants and photosynthetic algae that conduct photosynthesis by capturing light energy to synthesize carbohydrates.
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