ashworth college SC260 online exam 6 latest 2014 jan.

Part 1 of 1 – 100.0

Question 1 of 20
5.0 Points
Joseph Connell’s “intermediate disturbance
hypothesis” proposes that:
A. species diversity
is highest at intermediate frequencies of disturbance.
B. species diversity
is lowest at intermediate frequencies of disturbance.
C. population growth
rates are highest at intermediate frequencies of disturbance.
D. competitive
exclusion is fastest at intermediate levels of disturbance.

Question 2 of 20
5.0 Points
A “community” is defined as:
A. a group of
organisms that all make their living in a similar way.
B. a group of
individuals of a single species inhabiting a defined area.
C. the portion of a
defined area that supports life.
D. an association of
interacting species inhabiting a defined area.

Question 3 of 20
5.0 Points
In most ecological communities:
A. most species are
extremely rare.
B. few species are
very abundant.
C. most species are
moderately abundant.
D. both few species
are very abundant, and most species are moderately abundant.

Question 4 of 20
5.0 Points
Robert MacArthur’s study of forest warblers suggested that:
A. fewer warbler
species can survive in more complex habitats.
B. warbler species
diversity increases with habitat complexity.
C. warbler species
diversity decreases with habitat complexity.
D. most warblers
have rather similar foraging niches.

Question 5 of 20
5.0 Points
Niches of single-celled algae, such as diatoms, seem most
often to be distinguished by their requirements for:
A. different
combinations of inorganic nutrients.
B. different light
C. different water-flow
D. different water

Question 6 of 20
5.0 Points
In the Amazon forest, slight changes in soil properties tend
to be correlated with:
A. similar, slight
differences in plant communities.
B. no detectable
differences in plant communities.
C. dramatic
differences in plant communities.
D. dramatic
differences in plant communities only if the soil property in question is

Question 7 of 20
5.0 Points
In Robert Paine’s studies of the Washington intertidal
community, which organism proved to be a keystone species?
A. The whelk Thais
B. Acorn barnacles
C. Chitons
D. The starfish

Question 8 of 20
5.0 Points
In the Washington intertidal community studied by Robert
Paine, the most important limiting resource is:
A. space.
B. light.
C. plankton.
D. nitrogen.

Question 9 of 20
5.0 Points
We can infer a statistically significant difference between two
population means when:
A. our estimates of
the two means are different.
B. the variances of
the two means do not overlap.
C. the standard
deviations of the two means do not overlap.
D. the 95%
confidence intervals for the two means do not overlap.

Question 10 of 20
5.0 Points
Weaver ants provide effective protection of citrus trees
because they:
A. remove harmful
soft-scale insects (mealybugs).
B. remove all
plant-feeding insects.
C. cultivate
soft-scale insects, but do not allow them to feed on the trees.
D. cultivate
soft-scale insects, but still allow them to be attacked by parasitoids and

Question 11 of 20
5.0 Points
The Nile perch population explosion has been accompanied by:
A. a decrease in the
dissolved oxygen in the shallowest portions of Lake Victoria.
B. a decrease in the
dissolved oxygen in the deepest portions of Lake Victoria.
C. an increase in
the dissolved oxygen in the deepest portions of Lake Victoria.
D. an increase in
the dissolved oxygen in the shallowest portions of Lake Victoria.

Question 12 of 20
5.0 Points
Based on studies by Jane Lubchenko, what influence does the
population density of the herbivorous intertidal snail, Littorina littorea, have
on the number of algal species?
A. As snail density
increases from low to medium, the number of algal species increases.
B. As snail density
increases from medium to high, the number of algal species increases.
C. As snail density
increases from medium to high, the number of algal species decreases.
D. Both as snail
density increases from low to medium the number of algal species increases and
as snail density increases from medium to high, the number of algal species

Question 13 of 20
5.0 Points
Teja Tscharntke simplified the food web associated with the
wetland reed Phragmites australis by dividing the species into the following
major trophic levels?
A. Plant, herbivore,
piscivore, and granivore
B. Herbivore,
carnivore, detritivore, and consumer
C. Herbivore,
parasite, carnivore, and detritivore
D. Plant, herbivore,
parasite, and carnivore

Question 14 of 20
5.0 Points
Net primary productivity is the primary productivity of an
ecosystem, after subtracting energy lost in:
A. dead plant
B. inedible plant
C. respiration by
primary producers.
D. respiration by
primary consumers.

Question 15 of 20
5.0 Points
“Actual evapotranspiration” for an ecosystem
refers to the amount of water that:
A. is taken up from
soils by plant roots.
B. evaporates from
C. is transpired by
D. evaporates from
soils plus the amount transpired by plants.

Question 16 of 20
5.0 Points
Leibig’s “Law of the Minimum” stated that:
A. the lowest
primary productivity occurs in the coldest ecosystems.
B. primary
productivity is typically controlled entirely by climate.
C. primary
productivity is typically controlled by both climate and soil nutrients.
D. a single soil
nutrient typically limits primary productivity.

Question 17 of 20
5.0 Points
Experimental fertilizations in the Baltic Sea suggest that
primary productivity there is normally limited by:
A. phosphorus.
B. nitrogen.
C. iron.
D. potassium.

Question 18 of 20
5.0 Points
The “trophic cascade hypothesis” emphasizes the
role of:
A. nutrients in
controlling primary productivity.
B. nutrients in
controlling primary consumption.
C. grazing by
herbivores in controlling primary productivity.
D. grazing by
herbivores in controlling ecosystem nutrient levels.

Question 19 of 20
5.0 Points
In Hubbard Brook Experimental Forest, the largest
“standing stock” of energy is represented by biomass of:
A. living plant
B. dead plant
C. invertebrate
D. vertebrate

Question 20 of 20
5.0 Points
An increase about 1,000 years ago in 13C content of human
collagen from archeological sites in eastern North America probably records:
A. replacement of
vegetables and grains in the diet by meat.
B. replacement of
corn by beans and squash in the diet.
C. increasing
consumption of corn.
D. increasing levels
of 13C in soils.

Calculate the price
Make an order in advance and get the best price
Pages (550 words)
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Upload your instructions
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with Essay Fountain
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Thanks to the entire Team of Solutions.
Customer 452919, March 29th, 2022
I have never experienced receiving a paper past the due date and time. That is the only thing that displeases. I don't have time o Overall, your team does a great job.
Customer 452919, November 18th, 2021
Thank you for following the guidelines of discussion. Awesome! Hopefully the grade will be better than the first 2 discussions submitted. I was fearful when I received an email requesting to send a copy of the book. Please remember that I confirmed whether or not you all had access to the book before I submitted my first request for assistance.
Customer 452919, February 1st, 2023
Computer science
Thank You
Customer 453099, August 28th, 2022
Excellent and thank you!
Customer 452591, December 12th, 2020
Excellent work done. Thank you
Customer 452829, August 1st, 2021
Thank you so much!
Customer 453015, December 13th, 2021
Social Work and Human Services
The support team was available upon request. For the past two semesters I have been stressing on receiving my assignments on expected achievement dates. I value your service and hope that you all would improve your teamwork. I have been using this service now for 2-years and was totally satisfied. With this being said, I have spent at least a thousand plus dollars with this company. Knowing there are other competing companies that are on the market for a lot less than you guys are charging. "I trust that you all would get it together and avoid last minute communication which increases stress to the student."
Customer 452919, March 27th, 2024
Since I will be needing assistance from your Team, please do not block me from editing the paper. The entire did an awesome job on last semester and I never once encountered a situation as such. Thank you for your assistance and I look forward to working with the Team for the next 7 weeks of the semester.
Customer 452919, January 15th, 2022
The writer covered all points as expected by the professor. Thank you for your commitment to serve students.
Customer 452919, February 21st, 2024
Thank you so much!! Very much appreciated!
Customer 452717, April 20th, 2021
Very well written thank you
Customer 452667, April 8th, 2021
Customer reviews in total
Current satisfaction rate
3 pages
Average paper length
Customers referred by a friend
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat