Term
| Possible reasons why more species occur near the equator |
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Definition
More time without geological disruptions (e.g., glaciers)
Competition among species is more intense
Climatic stability |
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Term
| How does speciation normally occur? |
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Definition
| Allopatric speciation (one population becomes separated into two or more) |
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Term
| What factors lead to speciation? |
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Definition
Natural Selection
Variation within a trait
The trait provides a reproductive advantage
Trait is heritable
Sexual Selection
Genetic Drift |
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Term
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Definition
| cataclysmic event such as asteroid struck off Yucatan peninsula and caused drastic climate change wiping out 70% of life on earth |
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Term
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Definition
| o Environmental changes (e.g. glaciers) lead to allopatric speciation |
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Term
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Definition
Overkill hypothesis
Climate change hypothesis
Disease hypothesis
Meteor hypothesis |
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Term
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Definition
o Current extinction rate is higher than the baseline rate
o Both rare and common species can go extinct
o Island Effect |
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Term
| Top 3 reasons for extinction |
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Definition
Invasive species
Hunting
Habitat loss |
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Term
| How many species have gone extinct in Illinois over the last century |
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Definition
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Term
| There are more ____ species than amphibians, reptiles, birds, and mammals combined |
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Definition
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Term
| Why are there so many freshwater species of fish given the relatively low amount of freshwater habitat? |
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Definition
| Freshwater is easier to live in than saltwater and is generally warmer |
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Term
| What is the skeleton of sharks made of? |
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Definition
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