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Biology 1108 Questions and Answers (100%
Correct Answers) Already Graded A+
Population Ans: All of the individuals of a SINGLE SPECIES that interact.
Community Ans: All of the populations of LIVING things that interact in a
PLACE.
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Ecosystem Ans: A biological community of interacting organisms and
their physical environment. Includes biotic and abiotic components.
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Answer: What are at least 6 things you can measure that we can use to
help define an ecosystem? Use at least 2 biotic and 2 abiotic factors,
and be specific. Ans: 1. Average seasonal rainfall
2. Average seasonal temperature
3. Soil conditions
4. Biodiversity
5. Species interaction, for example, what is the predation of one species
on the other?
6. Are there any invasive species that compete for resources?
Name some of the environmental (ABIOTIC) factors that define an
ecosystem? Ans: 1. Climate-averages and seasonality. For example,
rainy seasons.
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2. Geology-bedrock, water, soils, topography.
3. Disturbance-Natural (tornado), human, and the scale and frequency
of such disturbances.
Name some of the environmental (BIOTIC) factors that define an
ecosystem? Ans: 1. Biodiversity-what kinds of organisms live there and in
what proportion.
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2. Biomass-for example, plants, wood, waste.
3. Species interactions-how the different species interact with one
another.
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4. Invasive or keystone species.
What is an invasive species? Ans: An organism that is not native to a
particular area. An invasive species is capable of causing extinctions of
native plants and animals, reducing biodiversity, competing with native
organisms for limited resources, or altering habitats.
Is there any defined size for an ecosystem? Ans: No, there are no
boundaries, mostly.
Mount St. Helens Ans: Located in Washington State and part of the
Cascade Mountains. It is a part of the temperate rainforest biome.
What happens to a biome as the elevation increases? Ans: At sea level,
there is tropical rainforest, and as we go up in elevation, there is
temperate forest, then taiga, then tundra, then polar ice at the top of
the mountain.
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Answer: What type of biome did Mt. St. Helen have prior to the volcanic
eruption? Ans: Old growth forest, rich soil.
*Predict how biotic and abiotic conditions change with elevation and
latitude. Ans: There is a gradual decrease in temperature with
increasing altitude and latitude. As you go north, there will be a gradual
change in plant communities. Humidity will also decrease as latitude
and altitude increase. The soil becomes drier, often frozen in the winter.
As you would expect, the plants and animals that can survive in such
conditions are likely fewer, so the biodiversity is also likely not as diverse.
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Tephra (ash) Ans: Rock dust
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After Mt. St. Helen erupted... Ans: nothing in the Pumice Plain survived.
After the eruption of Mt. St. Helen, there were 3 major areas of damage:
Ans: 1. Pumice Plain-received the most impact. Looked like the moon.
Nothing remained alive.
2. Blowdown Zone-trees snapped off at the ground.
3. Scorch Zone-least impacted and furthest away. Some plants
remained alive.
It has been many years since the eruption. How has the ecosystem
changed in that time? What affected the order of re-establishment?
Ans: The first to re-establish the area will need to be the FIRST who
reaches the area AND has the ability to survive in the conditions that
remain. Different organisms move at different rates. For example, birds
will likely be able to reach the Pumice Plain quickly, but amphibians will
likely take much longer.
1
Biology 1108 Questions and Answers (100%
Correct Answers) Already Graded A+
Population Ans: All of the individuals of a SINGLE SPECIES that interact.
Community Ans: All of the populations of LIVING things that interact in a
PLACE.
© 2026 Assignment Expert
Ecosystem Ans: A biological community of interacting organisms and
their physical environment. Includes biotic and abiotic components.
Guru01 - Stuvia
Answer: What are at least 6 things you can measure that we can use to
help define an ecosystem? Use at least 2 biotic and 2 abiotic factors,
and be specific. Ans: 1. Average seasonal rainfall
2. Average seasonal temperature
3. Soil conditions
4. Biodiversity
5. Species interaction, for example, what is the predation of one species
on the other?
6. Are there any invasive species that compete for resources?
Name some of the environmental (ABIOTIC) factors that define an
ecosystem? Ans: 1. Climate-averages and seasonality. For example,
rainy seasons.
,For Expert help and assignment handling,
2
2. Geology-bedrock, water, soils, topography.
3. Disturbance-Natural (tornado), human, and the scale and frequency
of such disturbances.
Name some of the environmental (BIOTIC) factors that define an
ecosystem? Ans: 1. Biodiversity-what kinds of organisms live there and in
what proportion.
© 2026 Assignment Expert
2. Biomass-for example, plants, wood, waste.
3. Species interactions-how the different species interact with one
another.
Guru01 - Stuvia
4. Invasive or keystone species.
What is an invasive species? Ans: An organism that is not native to a
particular area. An invasive species is capable of causing extinctions of
native plants and animals, reducing biodiversity, competing with native
organisms for limited resources, or altering habitats.
Is there any defined size for an ecosystem? Ans: No, there are no
boundaries, mostly.
Mount St. Helens Ans: Located in Washington State and part of the
Cascade Mountains. It is a part of the temperate rainforest biome.
What happens to a biome as the elevation increases? Ans: At sea level,
there is tropical rainforest, and as we go up in elevation, there is
temperate forest, then taiga, then tundra, then polar ice at the top of
the mountain.
, For Expert help and assignment handling,
3
Answer: What type of biome did Mt. St. Helen have prior to the volcanic
eruption? Ans: Old growth forest, rich soil.
*Predict how biotic and abiotic conditions change with elevation and
latitude. Ans: There is a gradual decrease in temperature with
increasing altitude and latitude. As you go north, there will be a gradual
change in plant communities. Humidity will also decrease as latitude
and altitude increase. The soil becomes drier, often frozen in the winter.
As you would expect, the plants and animals that can survive in such
conditions are likely fewer, so the biodiversity is also likely not as diverse.
© 2026 Assignment Expert
Tephra (ash) Ans: Rock dust
Guru01 - Stuvia
After Mt. St. Helen erupted... Ans: nothing in the Pumice Plain survived.
After the eruption of Mt. St. Helen, there were 3 major areas of damage:
Ans: 1. Pumice Plain-received the most impact. Looked like the moon.
Nothing remained alive.
2. Blowdown Zone-trees snapped off at the ground.
3. Scorch Zone-least impacted and furthest away. Some plants
remained alive.
It has been many years since the eruption. How has the ecosystem
changed in that time? What affected the order of re-establishment?
Ans: The first to re-establish the area will need to be the FIRST who
reaches the area AND has the ability to survive in the conditions that
remain. Different organisms move at different rates. For example, birds
will likely be able to reach the Pumice Plain quickly, but amphibians will
likely take much longer.
