Biodiversity Challenges and Human Impacts on Ecosystems

The video discusses biodiversity, highlighting its importance and the threats posed by human activities. It covers habitat destruction, overharvesting, pollution, and climate change as major factors reducing biodiversity. The introduction of alien species and the effects of climate change are also explored. The video emphasizes the need for conservation efforts to maintain biodiversity.

What is the estimated number of species on Earth?

• 5 million

• 8.7 million

• 10 million

• 12.5 million

How has the world population growth affected land use?

• Reduced agricultural land

• Decreased urbanization

• Changed land use for agriculture and urbanization

• Increased natural habitats

What is a consequence of habitat fragmentation?

• Populations split into smaller subunits

• Improved adaptation to challenges

• Enhanced biodiversity

• Increased species richness

What is a major effect of overharvesting?

• Improved biodiversity

• Stabilization of species populations

• Depletion of resources

• Increased resource availability

Which species have been affected by overharvesting?

• Wolves and bears

• Lions and tigers

• Elephants and spotted cats

• Deer and rabbits

What is eutrophication caused by?

• Excessive fishing

• Deforestation

• Runoff of phosphorus and nitrogen

• Air pollution

What is a consequence of acid rain?

• Enhanced plant growth

• Increased fish populations

• Lakes becoming more acidic

• Improved water quality

How many species are estimated to be in transit on ocean vessels daily?

• 3,000

• 2,000

• 1,000

• 4,000

What is a predicted impact of climate change on biodiversity?

• Decrease in ocean acidification

• Significant impacts on biodiversity

• Increase in sea ice

• Stabilization of weather patterns

What human activity is speeding up global warming?

• Reducing emissions

• Burning fossil fuels

• Planting more trees

• Increasing renewable energy use