| A | B |
|---|
| Decomposer | An organism that obtains nutrients by consuming dead and decaying organic matter which allows nutrients to be accessible to other organisms. |
| DNA | Deoxyribonucleic acid |
| Deoxyribonucleic acid | A biological macromolecule that encodes the genetic information for living organisms and is capable of self-replication and the synthesis of ribonucleic acid. |
| Diffusion | The movement of particles from an area of high concentration to an area of low concentration. |
| DNA Replication | The process in which DNA makes a duplicate copy of itself. |
| Dominant Inheritance | A pattern of inheritance in which the phenotypic effect of one allele is completely expressed within a homozygous and heterozygous genotype. |
| Ecology | The study of the relationships between organisms and their interactions with the environment. |
| Ecosystem | A system composed of organisms and nonliving components of an environment. |
| Embryology | The branch of zoology studying the early development of living things. |
| Endemic Species | A species that is found in its originating location and is generally restricted to that geographic area. |
| Endocytosis | A process in which a cell engulfs extracellular material through an inward folding of its plasma membrane. |
| Endoplasmic Reticulum | An organelle, containing folded membranes and sacs, responsible for the production, prodessing, and transportation of materials for use inside and outside a eukaryotic cell. |
| Endosymbiosis | A theorized process in which early eukaryotic cells were formed from simpler prokaryotes. |
| Energy Pyramid | A model that illustrates the biomass productivity at multiple trophic levels in a given ecosystem. |
| Energy Transformation | A process in which energy changes from one form to another form, while some energy is lost to the environment. |
| Environment | The total surroundings in an organism or group of organisms. |
| Enzyme | A protein that increases the rate of a chemical reaction without being changed by the reaction; an organic catalyst. |
| Eukaryote | A type of organism composed of one or more cells containing a membrane-bound nucleus, specialized organelles in the cytoplasm, and a mitotic nuclear division cycle. |
| Evolution (Biological) | A process in which new species develop from preexisting species. |
| Evolution (Genetic) | A change in the allele frequencies of a population of organisms from generation to generation. |
| Exocytosis | A process in which a cell releases substances to the extracellular environment by fusing a vesicular membrane with the plasma membrane, separating the membrane at the point of fusion and allowing the substance to be released. |
| Extinction | A term that typically describes a species that no longer has any known living individuals. |
| Extracellular | Located outside a cell. |
