How many species are estimated to be living on Earth?

• between 10,000 and 100,000
• between 500,000 and 1 million
• between 1 and 2 million
• between 10 and 50 million

Reasons for preserving biodiversity include all of the following except

• isolating unique genetic material so it can be incorporated into existing crops
• increasing the chances of discovering organisms with medicinal value
• preventing natural evolution
• finding new plants that can supplement the world’s food supply

Tags

NGSS.MS-LS2-5

The ecosystem approach to conservation is partly based on the idea that

• all rare species should be relocated to regional preserves
• human needs are of secondary importance
• keystone species are genetically superior to other organisms
• a healthy biosphere requires intact ecosystems

Tags

NGSS.MS-LS2-5

The human diet has been enriched with native food products such as sweet potatoes, beans, tomatoes, and corn that come from

• Pacific islands
• Southwest Asia
• Madagascar and Africa
• Central and South America

What level of biodiversity do people often call "biodiversity"?

• genetic diversity
• species diversity
• ecosystem diversity
• cultural diversity

Why is biodiversity important to ecosystems?

• It allows animals to feed permanently from one type of plant
• It increases at each level of the food chain
• It helps populations adapt to ecological changes
• It reduces the number of insects in a given ecosystem

Tags

NGSS.MS-LS2-5

The major human causes of extinction today are

• only hunting and destroying habitats
• only polluting and introducing non-native species
• hunting, destroying habitats, polluting and introducing non-native species
• none of these are human causes of extinction

Tags

NGSS.MS-ESS3-4

The number and variety of species on Earth is called

• biodiversity
• genes
• population
• dispersion

Tags

NGSS.MS-LS2-5

A(n) _________ is any species that is essential to the health of an ecosystem

• primary consumer
• producer
• endangered species
• keystone species

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

A recreational experience among humans and ecosystems is called ______________

• ecotourism
• biodiversity
• keystone moments
• bottlenecks