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29 Terms

1
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What is Ecology?

The study of interactions between organisms and their environment.

2
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What is a Population?

A group of individuals of the same species living in a particular area.

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What is a Community?

All the populations of different species living and interacting in a particular area.

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What is an Ecosystem?

The community of organisms and the physical environment they interact with.

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What is the Biosphere?

The part of Earth where life exists, including land, water, and air.

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Define Habitat.

The natural home or environment of an animal, plant, or other organism.

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Define Niche.

The role and position a species has in its environment; how it meets its needs for food and shelter, how it survives, and how it reproduces.

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What are Biotic Factors?

Living components of an ecosystem, such as plants, animals, and microorganisms.

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What are Abiotic Factors?

Non-living components of an ecosystem, such as temperature, sunlight, and water.

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Define Population Density.

The number of individuals per unit area or volume.

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What is Population Distribution?

The pattern of spacing among individuals within a population.

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What are Density-Dependent Factors?

Factors that affect population growth based on population size (e.g., competition, predation, disease).

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What are Density-Independent Factors?

Factors that affect population growth regardless of population size (e.g., natural disasters, weather).

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Define Carrying Capacity.

The maximum population size that an environment can sustain given available resources.

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What is Exponential Growth?

Population growth under ideal conditions, resulting in a J-shaped curve.

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What is Logistic Growth?

Population growth that levels off as population size approaches carrying capacity, resulting in an S-shaped curve.

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Define Interspecific Competition.

Competition between different species for the same resources.

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Define Intraspecific Competition.

Competition between individuals of the same species for the same resources.

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What is Predation?

An interaction in which one organism (the predator) kills and eats another organism (the prey).

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Define Herbivory.

An interaction in which an organism (the herbivore) eats parts of a plant or alga.

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What is Symbiosis?

A close and long-term interaction between two different species.

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Define Mutualism.

A symbiotic relationship in which both species benefit.

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Define Commensalism.

A symbiotic relationship in which one species benefits and the other is neither harmed nor helped.

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Define Parasitism.

A symbiotic relationship in which one species (the parasite) benefits and the other (the host) is harmed.

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What is a Food Chain?

A linear sequence of organisms through which nutrients and energy pass as one organism eats another.

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What is a Food Web?

A network of interconnected food chains in an ecosystem.

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Define Trophic Level.

The position an organism occupies in a food chain or food web.

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What are Producers?

Autotrophs that support all other trophic levels by producing their own food through photosynthesis or chemosynthesis.

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What are Consumers?

Heterotrophs that obtain energy