The Northern Pacific seastar is a particularly successful invasive species. Which of the following explains why it is so successful in the waters of southeastern Australia, outside of its native environment?(1 point)
Responses
It consumes the eggs of the spotted handfish.
It consumes the eggs of the spotted handfish.
It is accustomed to a cold climate.
It is accustomed to a cold climate.
It breeds rapidly and has no predators in this environment.
It breeds rapidly and has no predators in this environment.
It can cling to the bottom of ships and other vessels.
It can cling to the bottom of ships and other vessels.
All of the above.
bot i need one answer because not all of them are correct
The correct answer is: It breeds rapidly and has no predators in this environment.
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Aside from killing native species, what other negative issue might an invasive species present?(1 point)
Responses
They might increase the diversity of native species.
They might increase the diversity of native species.
They might provide economic benefit.
They might provide economic benefit.
They might avoid interacting with other organisms.
They might avoid interacting with other organisms.
They might introduce other organisms, like viruses and bacteria.
The correct answer is: They might introduce other organisms, like viruses and bacteria.
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What happens after coral is bleached?(1 point)
Responses
The coral produces peroxides.
The coral produces peroxides.
The coral dies immediately.
The coral dies immediately.
The coral releases algae into the ocean.
The coral releases algae into the ocean.
The coral is susceptible to starvation.
The coral is susceptible to starvation.
The correct answer is: The coral is susceptible to starvation.
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The most biodiverse ecosystem in the world is likely a(1 point)
Responses
coral reef.
coral reef.
tundra.
tundra.
taiga.
taiga.
cold desert.
The correct answer is: coral reef.
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The Florissant Fossil Beds in Colorado are home to several massive redwood stumps that were subjected to a special kind of fossilization millions of years ago. What service could these fossilized stumps most likely provide?(1 point)
Responses
tourism
tourism
shelter
shelter
soil creation
soil creation
lumber
The correct answer is: tourism.
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Marine biologist Dr. James Estes researched sea otters and their habitats in the Aleutian Islands of the North Pacific Ocean. Sea otters feed on animals such as crabs and urchins. Islands with sea otters contained a lot of kelp, a seaweed that is an important food source for fish and other sea animals. However, Islands without otters had large populations of urchins but no kelp since sea urchins feed on this seaweed. Since sea otters are able to control the population of urchins, this allows for kelp to freely grow in those areas. Given this information, what term best describes the otter in the Aleutian Islands ecosystem?(1 point)
Responses
keystone species
keystone species
producer
producer
apex predator
apex predator
decomposer
The correct answer is: keystone species.
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Your friend John is having trouble with his compost bin. The material in his compost pile doesn’t seem to be decomposing well. You take a sample of the pile and check for the presence of microorganisms under the microscope. You see that there are indeed microorganisms; however, they don’t appear to be growing very fast. John says that he regularly mixes his compost pile to expose it to oxygen but has noticed the pile feels cold. What is the most likely explanation for this problem?(1 point)
Responses
The compost pile contained aerobic bacteria.
The compost pile contained aerobic bacteria.
The compost pile was placed in the sunshine.
The compost pile was placed in the sunshine.
The compost pile was sufficiently moist.
The compost pile was sufficiently moist.
The compost pile contained incorrect amounts of "greens" and "browns".
The correct answer is: The compost pile contained incorrect amounts of "greens" and "browns".
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Green” material has high amounts of (1 point)
Responses
carbon.
carbon.
phosphorus.
phosphorus.
nitrogen.
nitrogen.
magnesium.
magnesium.
The correct answer is: nitrogen.
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Biodiversity Unit Test
11 of 1411 of 14 Items
Question
Some students decide to plant their own garden. They want to eat a more plant-based diet. For meat, they will buy locally from a butcher. Any remaining plant-based scraps will be composted and used as fertilizer for their garden.
Which part of this plan represents recycling to reduce their waste?
(1 point)
Responses
planting a garden
planting a garden
buying locally
buying locally
composting scraps
composting scraps
eating a plant-based diet
The correct answer is: composting scraps.
Plants, bison, elk, and wolves are all members of an ecosystem. The bison and elk are both primary consumers in this ecosystem, while the wolves are a predator. Over time, the bison completely disappear. Give an example of how the ecosystem may respond to this change, and explain how this relates to both resiliency and biodiversity.
The disappearance of bison due to any reason may affect the ecosystem in various ways. With fewer herbivores, the vegetation will grow taller, denser, and more diverse. Overgrazed areas of the ecosystem may regenerate, become greener, and provide homes for different plant species, birds, and insects. This growth supports a diversity of microorganisms, other animals, and fungi. However, without the bison as an important food source, the wolf population will reduce, or they will begin to prey on other animals, forcing more competition. This reduction can impact the health, size, and behavior of the wolf population and, eventually, biodiversity. Although too much change can be destructive, ecosystems with high resilience are better equipped to respond to changes and recover quickly. In this case, the ecosystem's resilience allowed some diversity to be maintained, but it can still have long-term effects on biodiversity and overall ecosystem health.
Beavers, large members of the rodent family in North America, are often referred to as “ecosystem/keystone engineers” by wildlife managers. Ecosystem engineers are described as animals that create, alter, or destroy a habitat. Beavers contribute to river ecosystems by bringing down old and dead trees along riverbanks. They use these trees to make their dams. Although these dams are primarily used for protection and food storage, scientists report that these dams change the surrounding environment in different ways.
Given this information, in three to five sentences, describe a potential benefit that beavers contribute to the ecosystem as keystone engineers and describe a plausible impact that the removal of beavers could have on the surrounding ecosystem.