ES Unit 4 Review
Flashcard
•
Biology
•
9th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is secondary succession?
Back
Secondary succession is the process of ecological recovery that occurs in an area where a disturbance has destroyed a community but left the soil intact, allowing for the re-establishment of the ecosystem.
2.
FLASHCARD QUESTION
Front
What is a keystone species?
Back
A keystone species is a species that has a disproportionately large effect on its environment relative to its abundance, playing a critical role in maintaining the structure of an ecological community.
3.
FLASHCARD QUESTION
Front
How do invasive species affect native species?
Back
Invasive species often compete with native species for resources such as food, water, and habitat, which can lead to the decline or extinction of native species.
4.
FLASHCARD QUESTION
Front
What is genetic drift?
Back
Genetic drift is a mechanism of evolution that refers to random changes in the frequency of alleles in a population, which can lead to significant changes over time, especially in small populations.
5.
FLASHCARD QUESTION
Front
What is geographic or allopatric speciation?
Back
Geographic or allopatric speciation occurs when a population is divided by a physical barrier, leading to the evolution of distinct species due to isolation and different selective pressures.
6.
FLASHCARD QUESTION
Front
What is the climax community?
Back
A climax community is a stable and mature ecological community that has reached a steady state, where species composition remains relatively unchanged until disrupted by an event.
7.
FLASHCARD QUESTION
Front
What role do disturbances play in ecosystems?
Back
Disturbances, such as fires or storms, can reset ecological succession, creating opportunities for new species to establish and promoting biodiversity.
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