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.