Which biome is best for animals that feed on grazing on grasses and small shrubs?
The savanna biome is best for animals that feed on grazing on grasses and small shrubs.
Biodiversity Unit Test
4 of 134 of 13 Items
Which describes a primary role of the pioneer species in an ecosystem?(1 point)
Responses
protect other species from danger
protect other species from danger
prevent fertile soil from washing away
prevent fertile soil from washing away
provide food for small animals
provide food for small animals
break down rock into soil
break down rock into soil
Break down rock into soil is a description of the primary role of the pioneer species in an ecosystem.
Biodiversity Unit Test
5 of 135 of 13 Items
Question
What happens after coral is bleached?(1 point)
Responses
The coral is susceptible to starvation.
The coral is susceptible to starvation.
The coral dies immediately.
The coral dies immediately.
The coral produces peroxides.
The coral produces peroxides.
The coral releases algae into the ocean.
The coral releases algae into the ocean.
The coral is susceptible to starvation after it is bleached.
The most biodiverse ecosystem in the world is likely a(1 point)
Responses
coral reef.
coral reef.
taiga.
taiga.
tundra.
tundra.
cold desert.
cold desert.
The most biodiverse ecosystem in the world is likely a(1 point)
Coral reef.
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)
Keystone species.
Dolphins are animals that live in water, but they do not have gills. What might this suggest about dolphins?(1 point)
This suggests that dolphins are mammals and not fish.
Dolphins are animals that live in water, but they do not have gills. What might this suggest about dolphins?(1 point)
Responses
They have another structure to obtain oxygen.
They do not need to release carbon dioxide.
They make their own food.
They do not need oxygen.
Biodiversity Unit Test
9 of 139 of 13 Items
Question
Which of the following is one response to higher temperatures in a habitat?(1 point)
Responses
more fat storage
more fat storage
thicker fur
thicker fur
more movement
more movement
more sweating
more sweating
Thicker fur is one response to higher temperatures in a habitat.
Why is fever an effective response to pathogens?(1 point)
Responses
Fever is an effective response to pathogens because it helps to increase body temperature, which in turn stimulates the immune system to fight off the harmful pathogens. The increase in temperature makes it difficult for the pathogens to survive and reproduce, and also activates white blood cells to attack and destroy the pathogens.
Why is fever an effective response to pathogens?(1 point)
Responses
It can signal the body to run.
It can signal the body to run.
It can signal the body to fight.
It can signal the body to fight.
It can remove pathogens from the body.
It can remove pathogens from the body.
It can inactivate pathogens in the body.
It can inactivate pathogens in the body.
It can inactivate pathogens in the body.
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.
Beavers contribute to the ecosystem by creating dams that cause water to pool in areas that weren't covered by water before. This change in water levels can lead to the creation of new habitat areas for various aquatic species. The dams also help to filter out sediment and pollutants and slow down the flow of water, which can reduce erosion and improve water quality. Additionally, the ponds created by beaver dams can be used by other organisms for drinking and as a source of food. If beavers were removed from the ecosystem, the absence of their damming activity could have a significant impact on the surrounding ecosystem by reducing the availability of habitat and resources for other species that rely on these aquatic environments.
A bird-watcher sees a small yellow bird in a tree. Explain to the bird-watcher how he can use a dichotomous key to identify the bird. Assume he does not know anything about dichotomous keys. Then, write two steps of a dichotomous key that would be helpful for the bird-watcher.(2 points)
You can use a dichotomous key to identify the bird by answering a series of questions that will help you narrow down the possible species that the bird can be. Each question has two possible answers, and depending on your answer, you will be directed to another question until you can identify the bird with confidence.
Two steps of a dichotomous key that would be helpful for the bird-watcher are:
1. Does the bird have a thin or thick beak?
- Thin beak: Proceed to question 2
- Thick beak: The bird is not a Yellow Warbler.
2. Does the bird have black stripes on its wings?
- Yes: The bird is a Yellow Warbler.
- No: The bird is not a Yellow Warbler.