| A | B |
|---|
| data | look up |
| data table | a visual instrument comprised of labeled columns and rows, used to arrange information |
| Daughter cell | look up |
| day | time for Earth to make a complete rotation on its axis |
| decomposed | separation of a substance into two or more substances that may differ from each other and from the original substance |
| decomposers | a person or thing that decomposes |
| Density | The state or quality of being dense; compactness; closely set or crowded condition |
| dependent variable | dependent variable is the observed result of the independent variable being manipulated. |
| difusion | separation of the life instinct from the death instinct, a process often accompanying maturity |
| Disease | look up |
| Distillation | The volatilization or evaporation and subsequent condensation of a liquid as when water is being boiled in a retort and the steam is condensed in a cool receiver |
| Divergent Evolution | The process by which a species evolved into two or more descendants |
| DNA | A nucleic acid that carries the genetic information in the cell and is capable of self-replication and synthesis of RNA. DNA consists of two long chains of nucleotides twisted into a double helix and joined by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine. The sequence of nucleotides determines individual hereditary characteristics. |
| Dominance | rule; control; authority; ascendancy. An allele that is expressed in the phenotype |
| Doppler effect | change in the apparent frequency of a wave as observer and source move toward or away from each other |
| double helix | the spiral arrangement of the two complementary strands of DNA |
| earth | 3rd planet from the sun |
| eclipse | one celestial body obscures another, solar eclipse - moon obscures the sun, lunar eclipse - earth obscures the moon |
| ecology | the branch of biology concerned with the relations between organisms and their environment |
| ecosystem | natural unit that consists of living and non-living parts which interact to form a stable system. |
| Effect | something that is produced by an agency or cause; result; consequence |
| electric force | force of attraction or repulsion between objects due to charge |
| electricity | a fundamental form of energy observable in positive and negative forms that occurs naturally or is produced and that is expressed in terms of the movement and interaction of electrons |
| electostatic force | look up |
| electrolisis | look up |
| electron | A sub-atomic particle with a negative quantised charge |
| Electronegativity | The ability of an atom to attract electrons when the atom is in a compound |
| element | look up |
| endoplasmic reticulum | a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum), involved in the transport of materials. |
| Endothermic Reaction | Causing or characterized by absorption of heat |
| energy | a thermodynamic quantity equivalent to the capacity of a physical system to do work |
| energy transfer | energy passed from one area to another thru conduction, convection or radiation |
| enzyme | look up |
| erosion | condition in which the earth's surface is worn away by the action of water and wind |
| Ethics | set of principals of right conduct; a system of moral values |
| eutrophication | look up |
| evaporation | look up |
| Evolution | The descent of organisms from preexisting life. |
| Evolutionary History | history of the evolution of a species |
| Exothermic Reaction | Realizing or giving off heat |
| experiment | look up |
| Extinction | The death of all members of a species |
