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Which of the following is not a secondary sexual trait?
Soil
The top layer of the Earth's surface, composed of mineral particles, organic matter, water, and air, which serves as a medium for plant growth.
Nutrients
Substances obtained from food that are vital for growth, maintenance of the body, and energy supply.
Estuaries
Coastal water bodies where freshwater from rivers and streams mixes with saltwater from the ocean, creating an ecologically rich environment.
Salinity
The concentration of dissolved salts in water, affecting the density, biodiversity, and chemical behavior of aquatic environments.
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