The passenger pigeon, like the American beaver, was a _______________ species -- i.e., a species that profoundly affects the environment and the success of plants and animals within its sphere.单项选择题
A
Capstone
B
Keystone
C
Covalent
D
Primary

Question

The passenger pigeon, like the American beaver, was a _______________ species -- i.e., a species that profoundly affects the environment and the success of plants and animals within its sphere.

BlackTom AI · Accepted Answer

The prompt asks about a passenger pigeon, like the American beaver, being a _______________ species—i.e., a species that profoundly affects the environment and the success of plants and animals within its sphere.
Option 1: Capstone. This term is not used in ecology to describe a species with broad, ecosystem-wide effects. Capstone more often appears in contexts like capstone projects or capstone species in different disciplines, but not in standard ecological terminology for keystone roles.
Option 2: Keystone. This is the classic ecological term for a species whose presence or absence disproportionately shapes community structure and ecosystem dynamics, such as regulating populations, enabling coexistence, or modifying habitats. The passenger pigeon, through mass migrations and seed dispersal, historically played a keystone role in many North American ecosystems, affecting plant and animal communities.
Option 3: Covalent. Covalent is a chemical bonding term referring to shared electron pairs between atoms. It has no relevance to describing a species’ ecological influence, so it’s not an appropriate fit for this context.
Option 4: Primary. While some species are called primary producers or primary consumers, the term primary alone does not capture the concept of disproportionately influencing the entire ecosystem; it describes a trophic level or a descriptive role, not the broad ecological impact implied by the prompt.
Overall, among the choices, the term that best matches the description of a species with profound ecosystem-wide influence is Keystone, aligning with established ecological definitions and examples.

The passenger pigeon, like the American beaver, was a _______________ species -- i.e., a species that profoundly affects the environment and the success of plants and animals within its sphere.单项选择题

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