Examlex
Use a calculator to find the natural logarithm correct to four decimal places.
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Temperature Extremes
Conditions where the environmental temperature is significantly higher or lower than the species' optimal range for survival.
Osteoporosis
A disease characterized by decreased bone density and increased risk of fractures.
Calcium
A chemical element symbolized by Ca, it is essential for living organisms, particularly in cell physiology and bone formation.
Keratin
A horny, water-insoluble protein found in the epidermis of vertebrates and in nails, feathers, hair, and horns.
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