Term
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Definition
| process by which organisms change over time |
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| New species can develop from old ones as a result of gradual change |
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Definition
| group of organisms that are able to reproduce together and create healthy, fertile offspring |
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| What help organisms survive in their environments? |
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Definition
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| Adaptations include ______________________. |
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Definition
| behaviors, physical characteristics, etc. |
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| How are changes in species caused? |
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Definition
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| What are the two possible things that happen to mutations? |
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Definition
1. may be passed on to future generation and eventually lead to new species
2. If the variation is harmful, organisms may die, and it will not be passed on |
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| What is natural selection? |
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Definition
| the survival of the organisms that have favorable traits |
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| Who developed the theory of natural selection? |
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Definition
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| How is Natural Selection used? |
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Definition
| Used to describe how evolution may occur |
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| What are the ideas behind evolution? |
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Definition
1. Overproduction: more offspring are produced than can survive
2. Struggle for existence: competition for necessities of life
3. Genetic Variation: differences in traits
*Color, size, abilities
4. Survival of the fittest: variations make organisms better suited for survival
* Successful reproduction |
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Term
| Sometimes people select which organisms get to reproduce. Give an example. |
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Definition
| farmers created numerous crops from wild mustard by artificially selecting for certain terms |
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Term
| What are homologous structures? |
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Definition
| Structures found in different species, but derived from a common ancestral structure. The structures may or may not be used for the same purpose. |
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| What are analogous structures? |
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Definition
| serve the same function in different species, but not derived from common ancestral structures |
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Term
| What is a vistigial structure? |
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Definition
body parts that seemingly have no purpose or function
*appendix, pelvic bones in whales, etc. |
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