Search
- https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_2%3A_The_Physical_Environment/2.3%3A_SoilsSoil is the outer loose layer that covers the Earth's surface and is the foundation for agriculture and forestry. Soils consist of organic material, inorganic material, water and air, and they differ ...Soil is the outer loose layer that covers the Earth's surface and is the foundation for agriculture and forestry. Soils consist of organic material, inorganic material, water and air, and they differ in proportions of clay, silt, and sand. A soil profile is characterized by horizontal layers called horizons. Climate, organisms, topography, parent material, and time influence soil composition and formation.
- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/02%3A_The_Physical_Environment/2.03%3A_SoilsSoil is the outer loose layer that covers the Earth's surface and is the foundation for agriculture and forestry. Soils consist of organic material, inorganic material, water and air, and they differ ...Soil is the outer loose layer that covers the Earth's surface and is the foundation for agriculture and forestry. Soils consist of organic material, inorganic material, water and air, and they differ in proportions of clay, silt, and sand. A soil profile is characterized by horizontal layers called horizons. Climate, organisms, topography, parent material, and time influence soil composition and formation.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/15%3A_The_Anatomy_and_Physiology_of_Animals/15.01%3A_Nutrition/15.1D%3A_Recommended_Dietary_AllowancesThis page details the Recommended Dietary Allowances (RDAs) and additional intake categories established by the Food and Nutrition Board, including adequate intake (AI) and tolerable upper intake leve...This page details the Recommended Dietary Allowances (RDAs) and additional intake categories established by the Food and Nutrition Board, including adequate intake (AI) and tolerable upper intake levels (UL) to prevent excess. It includes specific RDAs and AIs for essential nutrients tailored to young adult males and females, highlighting gender differences in recommendations. Concerns are raised about optimal vitamin intake and the role of beta-carotene in meeting vitamin A needs.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/16%3A_The_Anatomy_and_Physiology_of_Plants/16.02%3A_Plant_Physiology/16.2A%3A_XylemThis page discusses how plants absorb water and nutrients through their roots, which travel to leaves via the xylem, primarily driven by transpiration. This process creates tension that can lead to ca...This page discusses how plants absorb water and nutrients through their roots, which travel to leaves via the xylem, primarily driven by transpiration. This process creates tension that can lead to cavitation. Additionally, it explains root pressure, which can cause sap to ooze from stems, illustrated by the sugar maple's spring behavior.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/15%3A_The_Anatomy_and_Physiology_of_Animals/15.01%3A_Nutrition/15.1C%3A_NutritionThis page covers essential nutrients (calories, amino acids, fatty acids, minerals, vitamins) necessary for health, outlining deficiencies and diseases they can cause. It discusses food guidelines, fo...This page covers essential nutrients (calories, amino acids, fatty acids, minerals, vitamins) necessary for health, outlining deficiencies and diseases they can cause. It discusses food guidelines, food labels, and the roles of various vitamins and minerals. Additionally, it addresses dietary regulation, focusing on the hypothalamic mechanisms controlling appetite, including the interplay of AgRP/NPY-releasing neurons and POMC neurons.
