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- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_Life/2.08%3A_EnantiomersThis page explains the tetrahedral arrangement of carbon atoms forming four covalent bonds, exemplified by methane. It discusses how the presence of different groups around carbon can lead to enantiom...This page explains the tetrahedral arrangement of carbon atoms forming four covalent bonds, exemplified by methane. It discusses how the presence of different groups around carbon can lead to enantiomers, using alanine as an example of L- and D- formations, emphasizing the predominance of L amino acids in protein synthesis. Chirality's importance is highlighted, noting that a protein's functionality depends on its shape.
- https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_19%3A_Food_Webs/19.3%3A_Trophic_CascadesIn both Zion National Park and Yosemite National Park, the increase in human visitation during the first half of the 20th century was found to correspond to the decline of native cougar (Puma concolor...In both Zion National Park and Yosemite National Park, the increase in human visitation during the first half of the 20th century was found to correspond to the decline of native cougar (Puma concolor) populations in at least part of their range.
- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/19%3A_Food_Webs/19.03%3A_Trophic_CascadesIn both Zion National Park and Yosemite National Park, the increase in human visitation during the first half of the 20th century was found to correspond to the decline of native cougar (Puma concolor...In both Zion National Park and Yosemite National Park, the increase in human visitation during the first half of the 20th century was found to correspond to the decline of native cougar (Puma concolor) populations in at least part of their range.
- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.01%3A_Biogeochemical_CyclesSome other examples of reservoirs or pools for water you will encounter in the course include glaciers; the soil layer; the aggregate of bodies of fresh water on the continents (rivers and lakes). If ...Some other examples of reservoirs or pools for water you will encounter in the course include glaciers; the soil layer; the aggregate of bodies of fresh water on the continents (rivers and lakes). If the flux of material into and out of a given reservoir is the same for some period of time, that reservoir is said to be in a steady state.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/01%3A_The_Chemical_Basis_of_Life/1.02%3A_Elements_and_AtomsThis page explains that elements are pure substances composed of one type of atom, crucial for life, with only around 25 of Earth's 90 elements being essential. It details atomic structure, focusing o...This page explains that elements are pure substances composed of one type of atom, crucial for life, with only around 25 of Earth's 90 elements being essential. It details atomic structure, focusing on the nucleus and outer electrons, which dictate chemical behavior, valence, and electronegativity. Elements with similar outer electron configurations share chemical properties and react to achieve stability.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/02%3A_The_Molecules_of_Life/2.02%3A_HydrocarbonsThis page discusses hydrocarbons, organic compounds made of carbon and hydrogen, categorized into aliphatic (linear chains) and aromatic (ring structures). Aliphatic hydrocarbons include saturated com...This page discusses hydrocarbons, organic compounds made of carbon and hydrogen, categorized into aliphatic (linear chains) and aromatic (ring structures). Aliphatic hydrocarbons include saturated compounds like methane and unsaturated types like ethylene. Aromatic hydrocarbons are based on benzene rings and occur in biological molecules, including amino acids, cholesterol, and hormones. Beta-carotene is highlighted as a hydrocarbon containing both aliphatic and aromatic components.
- https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_20%3A_Biogeochemical_Cycles/20.1%3A_Introduction_to_Biogeochemical_CyclesThe recycling of inorganic matter between living organisms and their environment is called a biogeochemical cycle. It is important to remember that while matter and energy are processed in cycles, th...The recycling of inorganic matter between living organisms and their environment is called a biogeochemical cycle. It is important to remember that while matter and energy are processed in cycles, they are not necessarily moving in a simple circle and do not really have a beginning or an end. Today, anthropogenic activities are altering all major ecosystems and the biogeochemical cycles they drive.
- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/24%3A_Human_Impact_on_Global_Climate/24.01%3A_Anthropogenic_Climate_ChangeWhen sea ice melts, as it has done in the Arctic Ocean at a disturbing rate over the past decade, the albedo of the area affected changes dramatically, from around 80% down to less than 10%. This is a...When sea ice melts, as it has done in the Arctic Ocean at a disturbing rate over the past decade, the albedo of the area affected changes dramatically, from around 80% down to less than 10%. This is a positive feedback because much more solar energy is absorbed by the water than by the pre-existing ice, and the temperature increase is amplified.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/17%3A_Ecology/17.02%3A_Cycles_of_Matter_in_the_Biosphere/17.2A%3A_Carbon_CycleThis page discusses the importance of carbon in living organisms, sourced from nonliving environments such as carbon dioxide, limestone, and fossil fuels. It highlights the increasing atmospheric CO2 ...This page discusses the importance of carbon in living organisms, sourced from nonliving environments such as carbon dioxide, limestone, and fossil fuels. It highlights the increasing atmospheric CO2 due to human activities like fossil fuel burning and deforestation, which accounts for about half of the rise. The CO2 increase contributes to the greenhouse effect and global warming, alongside other greenhouse gases like methane, leading to significant environmental changes.
- https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.03%3A__The_Carbon_CycleThe overall effect is that carbon is constantly recycled in the dynamic processes taking place in the atmosphere, at the surface and in the crust of the earth. In 2018, the additional flux of carbon i...The overall effect is that carbon is constantly recycled in the dynamic processes taking place in the atmosphere, at the surface and in the crust of the earth. In 2018, the additional flux of carbon into the atmosphere from anthropogenic sources was estimated to be 36.6 gigatons of carbon (GtC = 1 billion tons of carbon)—a significant disturbance to the natural carbon cycle that had been in balance for several thousand years previously.
