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Question 11 (1 point)

What is the difference between a keystone species and an invasive species?

A. A keystone species and an invasive species both harm the ecosystem and are non-native.

B. A keystone species and an invasive species both are essential to the functioning of the ecosystem.

C. An invasive species is a species that is crucial to the functioning of the ecosystem, whereas a keystone species is non-native and causes major problems in the ecosystem.

D. A keystone species is a species that is crucial to the functioning of the ecosystem, whereas an invasive species is non-native and causes major problems in the ecosystem.

Question 12 (1 point)

A predator is an animal that:

A. kills and eats other animals

B. lives inside another animal

Time left for this assessment: 35:01

Answer :

Final answer:

A keystone species is crucial for maintaining the structure of an ecosystem, whereas an invasive species is non-native and often disrupts the ecosystem by outcompeting native species and causing ecological harm.

Explanation:

The main difference between a keystone species and an invasive species is their impact on the ecosystems where they exist. A keystone species is one that has a profound and stabilizing effect on the community structure and biodiversity despite its relatively low numbers. Its presence or absence can greatly alter the ecosystem. An example is the sea star in coral reef communities, which controls populations of mussels and sea urchins — other natural prey would flourish without them, likely resulting in a lesser ecosystem.

On the contrary, an invasive species is not native to the ecosystem and tends to significantly upset the natural balance. These are species that have been introduced, often by human activities, into an area out of their native range and can reproduce rapidly, have few natural predators in the new environment, and outcompete native species, leading to ecological and economic damage.

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Rewritten by : Barada

Final answer:

A keystone species is crucial to the functioning of an ecosystem, while an invasive species causes harm to the ecosystem.


Explanation:

A keystone species and an invasive species have distinct differences. A keystone species is a species that plays a crucial role in maintaining the balance and stability of an ecosystem. Its removal can have a significant impact on the ecosystem. On the other hand, an invasive species is a non-native species that causes harm to the ecosystem it invades. It disrupts the native species and ecosystems, often outcompeting them for resources.


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