Which is most likely a keystone species? (1 point)
wolves in Yellowstone National Park, which eat elk, who graze on willows, on which beavers depend to build their dams
feral cats, which hunt a wide variety of animals, including birds, lizards, rodents, and insects
deer, which eat a variety of plants, including shrubs and young trees,
• and are consumed by large predators like mountain lions, wolves, and
bears
cane toads in Australia, which were introduced to eat cane beetles, but eat anything and survive in various habitats
Wolves in Yellowstone National Park, which eat elk, who graze on willows, on which beavers depend to build their dams
Environmental changes like increased temperature can stress an ecosystem. Why is this an issue with regard to invasive species?
(1 point)
Ecosystems are destroyed by environmental changes, and then
• invasive species establish a new ecosystem, so the original organisms can never reintegrate.
• Invasive species are more easy to introduce to a stressed ecosystem.
Invasive species thrive in stressed ecosystems like those with warmer temperatures.
• Ecosystems are unable to recover as quickly from damage due to invasive species and environmental changes.
Ecosystems are unable to recover as quickly from damage due to invasive species and environmental changes.
Which statement is true? (1 point)
• Insects can delay the decomposition process.
• Composting speeds up the decomposition of organic material.
• Organic material will not decompose without the help of composting.
• Decomposition only involves microorganisms like bacteria.
Composting speeds up the decomposition of organic material.
How do traditional food production practices contribute to a reduction in biodiversity? (1 point)
Air, land, and water are used to produce food, so food that is thrown away is a waste of those original resources.
• Livestock raised for meat are not as diverse as wild species.
Land that is converted to agriculture is no longer a suitable habitat for native species.
Agricultural crops are not a good source of food for wild or native
Land that is converted to agriculture is no longer a suitable habitat for native species.
Aside from killing native species, what other negative issue might an invasive species present? (1 point)
• They might introduce other organisms, like viruses and bacteria.
• They might avoid interacting with other organisms.
• They might increase the diversity of native species.
• They might provide economic benefit.
They might introduce other organisms, like viruses and bacteria.
"Green" material has high amounts of (1 point)
nitrogen.
• magnesium.
carbon.
• phosphorus.