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Voc.1&3 LifeOverTime
| Question | Answer |
|---|---|
| Mass Extinction | When large numbers of entire species become extinct at nearly the same time |
| Evolution | Change over time of species of organisms, or Earth |
| Natural Selection | Process where members of a species that are best suited to their environment survive and reproduce at a higher rate |
| Adaption | Trait that gives an organism an advantage in its environment and increases its chances of survival |
| Speciation | Evolution of a new species from an existing species |
| Ancestor | Distant or early form of an organism from which later organisms descend |
| Vestigial Organ | Physical structure that was fully developed and functional in an earlier group but is reduced and unused in later species |
| Homologous Structures | Physical structure that is similar and used for a similar purpose in different species |
| Mutation | Random change to a gene that results in a new trait |
| Population Dynamics | Study of changes in the number of individuals in a population and the factors that effect those changes |
| Carrying Capacity | Maximum size that a population can reach in an ecosystem |
| Population Density | Measure of the number of organisms in a given area |
| Immigration | Movement of an organism into a range inhabited by the same species |
| Emigration | Movement of individuals out of an ecosystem |
| Limiting Factor | Factor or condition that prevents the continuing growth of a population in an ecosystem |
| Opportunist | Species characterized by a relatively short life span and large quantities of offspring |
| Competitor | Species characterized by a relatively long life span with few offspring |
| Fossil | Traces or remains of living things from long ago |
| Index Fossil | Fossils of organisms that were common, that lived in many areas, and that existed only during specific spans of time |
| Unicellular Organism | A single-celled organism, or a organism that consists of only one cell |
| Multicellular Organism | Organisms that consist of more than one cell |
| Gene | A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring |
| Species | A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. |
| Pollution | The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects |
| Population | All the inhabitants of a particular town, area, or country |
| Darwin | English natural historian and geologist' a proponent of the theory of evolution by natural selection. |
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balbuenazn
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