A population of birds is found on a remote island. Which of the following information is most important in deciding if the birds all belong to a single species?
extirpation and extinctionspeciation and immigrationspeciation and extinctionimmigration and extirpationemigration and extinction
species, ecosystem, and biosphere levelsspecies and ecosystem levelsgenetic, species, ecosystem, and biosphere levelsgenetic, species, and ecosystem levels

Global biodiversity exists in a number of patterns. The largest and most obvious of these is that biodiversity is __________.

You are watching: Ecotourism ________.


higher at the start of a river than at its enddistributed evenly across Earth"s surfacegreatest at the equator and drops as you move farther north or southgreatest at high elevations but drops as you descend
Equatorial climatic conditions favor generalists.Stable equatorial climatic conditions discourage any one species from dominating the ecosystem and encourage biodiversity.
Glaciation events at the equator promote species diversity.Equatorial climatic conditions provide little energy, so species must work together to share what is available.
Vocabulary Review: BiodiversityDrag the terms on the left to the appropriate blanks on the right to complete the sentences.
1. A species
is a distinct type of organism, a set of individuals that uniquely share certain characteristics and can breed with one another and produce fertile offspring.2. Extinction occurs when the last individual of a given species dies, and the species ceases to exist.3. When a species disappears from an area it once occupied, but the species still exists elsewhere, this is called extirpation.4. The number or variety of species in a given region is called species diversity.5. Populations with very little genetic diversity are vulnerable to environmental change because they may lack the ability to adapt to different conditions.

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6. Biodiversity is defined as the variety of life across all levels of biological organization.
increases the number of available pathogensis a potential source of new food items or new genetic varieties of existing foodsdecreases the number of predatorsreduces the number of pollinators available to any one plant speciesmeans that there is genetic uniformity
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