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| 4791092385 | Organic vs. inorganic compounds | The distinction between inorganic and organic compounds is not always clear. Organic chemists traditionally refer to any molecule containing carbon as an organic compound and by default this means that inorganic chemistry deals with molecules lacking carbon. | 0 | |
| 4791094155 | Kinetic vs. potential energy | A simple cartoon film ,consisting simple explanation on the difference between Potential and Kinetic energy.Potential energy is the stored energy in an object due of its position or its configuration whereas Kinetic energy is the energy which a body possesses because of its motion. | 1 | |
| 4795666021 | Radioactive decay and half life | the time required for one half the atoms of a given amount of a radioactive substance to disintegrate. 2. Also called biological half-life. Pharmacology. the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. | 2 | |
| 4795667345 | Law of conservation of matter | the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed. Expand. Also called law of conservation of mass, conservation of matter. | 3 | |
| 4795674142 | 1st law of thermodynamics | The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed. | 4 | |
| 4795674143 | 2nd law of thermodynamics | The second law of thermodynamics states that the total entropy of an isolated system always increases over time, or remains constant in ideal cases where the system is in a steady state or undergoing a reversible process. | 5 | |
| 4804596008 | Entropy | a thermodynamic quantity representing the unavailability of a system's thermal energy for conversion into mechanical work, often interpreted as the degree of disorder or randomness in the system. | 6 | |
| 4804596009 | Species | a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g., Homo sapiens. | 7 | |
| 4804596010 | Population | all the inhabitants of a particular town, area, or country. | 8 | |
| 4804597623 | Community | a group of people living in the same place or having a particular characteristic in common. | 9 | |
| 4804597624 | Ecosystem | a biological community of interacting organisms and their physical environment. | 10 | |
| 4804597638 | Biosphere | the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms. | 11 | |
| 4804599734 | Producers/autotrophs | An organism capable of synthesizing its own food from inorganic substances using light or chemical energy. Green plants, algae, and certain bacteria are autotrophs. | 12 | |
| 4804601597 | Consumers/heterotrophs | A heterotroph is known as a consumer in the food chain. Consumers are organisms that cannot make their own food supply. They use the food that producers make, or they eat other organisms. Animals are consumers. | 13 | |
| 4804603343 | Decomposers | an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material | 14 | |
| 4804603344 | Photosynthesis | the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct. | 15 | |
| 4804604452 | Respiration | a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances. | 16 | |
| 4804605351 | Adaption | a change or the process of change by which an organism or species becomes better suited | 17 | |
| 4804605352 | Gene pool | the stock of different genes in an interbreeding population. | 18 | |
| 4804606529 | Natural selection | he process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution. | 19 | |
| 4804608040 | Biological diversity | the variability among living organisms from all sources including, inter alia, terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems. | 20 | |
| 4804610334 | Genetic diversity | is the total number of genetic characteristics in the genetic makeup of a species. It is distinguished from genetic variability, which describes the tendency of genetic characteristics to vary. Genetic diversity serves as a way for populations to adapt to changing environments. | 21 | |
| 4804610335 | Species diversity | Species diversity refers to the measure of diversity in an ecological community. Species diversity takes into consideration species richness, which is the total number of different species in a community. It also takes into account evenness, which is the variation of abundance in individuals per species in a community. | 22 | |
| 4804611337 | Extinction | the state or process of a species, family, or larger group being or becoming extinct. | 23 | |
| 4804611338 | Food chain | a hierarchical series of organisms each dependent on the next as a source of food. | 24 | |
| 4804614216 | Food web | a system of interlocking and interdependent food chains. | 25 | |
| 4804614217 | Tropic level | each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy. | 26 | |
| 4804614218 | Biomass | the total mass of organisms in a given area or volume. | 27 | |
| 4804617566 | Pyramid of energy flow | An energy pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain. From the bottom-up, they are as follows: Producers — bring energy from nonliving sources into the community. | 28 | |
| 4804618830 | Pyramid of biomass | A pyramid of biomass is a more accurate indication of how much energy is passed on at each trophic level. Biomass is the mass of living material in each organism multiplied by the total number of organisms in that trophic level. | 29 | |
| 4804620775 | Biogeochemical cycles | In Earth science, a biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through both biotic (biosphere) and abiotic (lithosphere, atmosphere, and hydrosphere) components of Earth. | 30 |
