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?
a
apex predator
b
producer
c
keystone species
d
decomposer
c) keystone species
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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 have another structure to obtain oxygen.
They do not need oxygen.
They do not need oxygen.
They do not need to release carbon dioxide.
They do not need to release carbon dioxide.
They make their own food.
They make their own food.
The most accurate response is: "They have another structure to obtain oxygen." Dolphins, like other marine mammals, have lungs and breathe air like humans do. They come to the surface of the water to breathe in oxygen and exhale carbon dioxide.
Which of the following is one response to higher temperatures in a habitat?(1 point)
Responses
more movement
more movement
more fat storage
more fat storage
thicker fur
thicker fur
more sweating
more sweating
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 inactivate pathogens in the body.
It can inactivate pathogens in the body.
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.
Fever is an effective response to pathogens because it can inactivate pathogens in the body. Elevated body temperature can stimulate the immune system to produce more white blood cells, which can attack and eliminate 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 inactivate pathogens in the body.
It can inactivate pathogens in the body.
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.
Fever is an effective response to pathogens because it can inactivate pathogens in the body. Elevated body temperature can stimulate the immune system to produce more white blood cells, which can attack and eliminate pathogens.
Keystone speice
A keystone species is a species of plant or animal that has a disproportionate effect on its environment compared to its abundance. In other words, their impact is much greater than what would be expected based on their population size. Keystone species play a crucial role in maintaining the structure and function of an ecosystem, and their removal can cause significant changes in the ecosystem. Examples of keystone species include beavers, sea otters, and predators like lions and wolves.
Dolphins are animals that live in water, but they do not have gills. What might this suggest about dolphins?
Since dolphins live in water but do not have gills, this suggests that they have developed an alternative structure to obtain oxygen. Dolphins are mammals, which means they have lungs just like humans. They come to the surface of the water to breathe in air and exhale carbon dioxide.
Which of the following is one response to higher temperatures in a habitat?
One response to higher temperatures in a habitat is "more sweating". This is a common response among mammals and humans, as sweating helps to cool down the body by releasing heat through evaporation. Some other responses to higher temperatures include seeking shade or cooler environments, reducing activity levels, and panting.
Which of the following is one response to higher temperatures in a habitat?
thicker fur
thicker fur
more movement
more movement
more fat storage
more fat storage
more sweating
One response to higher temperatures in a habitat is "more sweating". This is a common response among mammals and humans, as sweating helps to cool down the body by releasing heat through evaporation. Some other responses to higher temperatures include seeking shade or cooler environments, reducing activity levels, and panting.
Why is fever an effective response to pathogens
Fever is an effective response to pathogens because it is a sign that the body's immune system is working to fight off the infection. When pathogens such as bacteria or viruses enter the body, they can trigger an immune response, which includes the release of chemicals that can cause the body's temperature to rise. This increase in temperature can help to fight off the invading pathogens in several ways.
For one, the higher temperature can make it more difficult for the pathogens to survive and reproduce. Additionally, a fever can signal the immune system to produce more white blood cells, which can help destroy the pathogens. Lastly, some studies suggest that fever may stimulate an adaptive response in the immune system, which can make it easier for the body to fight off future infections.
Overall, while fever itself can be uncomfortable and sometimes dangerous if it gets too high, it is an important and effective response to pathogens that helps the body to fight off infections.