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| The variety of life on Earth. |
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| What are the three sections to biodiversiy? |
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| Species diversity, ecosystem diversity, and genetic diversity. |
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| What is species diversity? |
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| All living things on Earth and their species.
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| What is ecosystem diversity? |
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| All of the habitats on Earth. |
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| How many species are there? |
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| About 10 million – 300 million |
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| What is genetic diversity? |
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| The genetic variation present in a population or species. |
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| What does genetic diversity help? |
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| Safeguard against future problems (diseases or natural disasters). |
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| True or false, loss of biodiversity is one of our most urgent environmental problems? |
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| When human population increases, biodiversity ___________.
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| How do invasive species affect biodiversity? |
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| They reproduce quickly and spread in large area, using lots of natural resources. |
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| What are some ways that invasive species get introduced to Pennsylvania? |
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| Dumping aquarium plants, waterways, various imported products. |
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| The state of equilibrium with our environment. |
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| What was the “Endangered Species Act of 1973” and who was the law signed by? |
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| It was a law designed to protect critically imperiled species from extinction.
It was signed by President Nixon |
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| How many threated and endangered animals and plants are there in the United States. |
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| 481 – animals795 – plants |
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| What does endangered mean? |
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| A species that is in imminent danger of extinction or extirpation throughout the range of Pennsylvania. |
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| What does threatened mean? |
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| A species that may become endangered within the foreseeable future throughout the range of Pennsylvania. |
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| What does extirpated mean? |
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| A species that has disappeared from Pennsylvania, bit still exist elsewhere. |
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| A species that occurred in Pennsylvania, but no longer exists. |
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