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Sea Urchin Lab

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Subject
Environmental Science
School
Northern Virginia Community College
Type
Homework
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General Environmental Science I
ENV 121
LAB: Ocean Acidification Name: ________________
Introduction:
(Deleted for plagiarism purposes)
Procedure:
(Deleted for plagiarism purposes)
Please watch the videos and answer the following questions.
What color is the water in the flask initially immediately before the person starts blowing
through the straw? Pink
What color does the water turn after the person stops blowing through the straw? Colorless
What caused the water to change color? The CO2 blown through the straw by the experimenter
What does the chalk represent in the second video? Coral Reefs
What happens to the chalk? The calcium carbonate dissolves.
The remainder of the lab is an on-line simulation. Please go to the following website:
http://web.stanford.edu/group/inquiry2insight/cgi-bin/vu-r1b/vu.php?view=acidocean
This activity requires flash player to run. Make sure you have flash on your electronic device.
Part 1:
Go through part one and read about ocean acidification and what types of organisms will be
impacted. Take time to go through the model “exploring carbon levels and effects” then answer
the following questions:
What is the current level of atmospheric CO
2
? (Use 2010 data). What is the current ocean pH?
380 ppm for 2010. The current pH is about 8.1
Under the most optimistic scenario what is the atmospheric CO
2
level and ocean pH in 2090?
Under the most pessimistic scenario what is the atmospheric CO
2
level and ocean pH in 2090?
Optimistic Scenario: Atmospheric 545 ppm / Ocean pH 7.92
Pessimistic Scenario: Atmospheric 885 ppm / Ocean pH 7.73

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What is the sea urchin’s skeleton made of? Why does this make them a good organism for
studying ocean acidification?
See urchins are calcifiers, their skeletons are made of Calcium Carbonate, which renders them
susceptible for dissolution under acidic conditions.
Write a hypothesis to explain what you think will happen in this lab.
If the acidity of the ocean increases, then the viability of sea urchin larvae will decrease.
Part 2:
Complete the virtual lab exploring the impact of ocean acidification on sea urchin larvae. Read
and follow the instructions carefully. You can’t move on to the next task until you have fully
completed the previous task. I suggest keeping the hints on. It will let you know exactly what
you need to do to move on to the next task. Answer the questions as you work through the lab:
What are the two different pH treatments you are using? Why?
pH 8.1 and pH 7.7, to study the impact on the expected pH at the end of the century compared
to current ocean pH today
How did you drop the pH of the second treatment?
By adding CO2 to the flask. CO2 decreases ocean pH.
Why do you add algae to the cultures?
To recreate an adequate environment similar to that of the ocean (Algae provide Oxygen)
After 2 days when you examine the pH of your treatments, did the pH change in either
treatment? If so, why?
Yes, due to atmospheric CO2 (in the 7.7 jars)
How many replicates are there of each treatment? Three
Part 3: Data Collection
Measure each of the three sea urchin larvae from both of the treatments and record your
individual measurements and your average.
Treatment pH 7.7 Treatment pH 8.1
1. 420 micrometers 1. 520 micrometers
2. 480 micrometers 2. 540 micrometers
3. 540 micrometers 3. 520 micrometers
Avg. 480 micrometers Avg. 526.67 micrometers

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General Environmental Science I ENV 121 LAB: Ocean Acidification Name: ________________ Introduction: (Deleted for plagiarism purposes) Procedure: (Deleted for plagiarism purposes) Please watch the videos and answer the following questions. What color is the water in the flask initially immediately before the person starts blowing through the straw? Pink What color does the water turn after the person stops blowing through the straw? Colorless What caused the water to change color? The CO2 blown through the straw by the experimenter What does the chalk represent in the second video? Coral Reefs What happens to the chalk? The calcium carbonate dissolves. The remainder of the lab is an on-line simulation. Please go to the following website: http://web.stanford.edu/group/inquiry2insight/cgi-bin/vu-r1b/vu.php?view=acidocean This activity requires flash player to run. Make sure you have flash on your electronic device. Part 1: Go through part one and read about ocean acidification and what types of organisms will be impacted. Take time to go through the model “exploring carbon levels and effects” then answer the following questions: What is the current level of atmospheric CO2? (U ...
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