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A) Explain why temperature is such an important player in growth and energy balance in aquatic organisms (i.e., what is the temperature actually affecting?

B) If an aquatic organism (say, a bass) has a limited food supply, why would it be beneficial to occupy cooler water temperatures?

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Deanna Hettinger
Deanna HettingerLv2
26 Mar 2018

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1. As water cools below 4°C, it expands and becomes less dense. Why is this beneficial to organisms living in a lake during a cold winter?

2. Given that heat readily transfers between an organism’s body and water, what would you predict about the temperature of the boundary layer around an animal’s body compared to the temperature of the surrounding water in cold weather?

3. Based on the properties of water, why do non-polar compounds such as fats and oils not dissolve well in water?

4. In lakes around the world, some have thick deposits of limestone, which is made up of calcium carbonate, and are resistant to the effects of acid rain. What parallels can you draw between these lakes and the smokestack scrubbers being used in coal-powered factories?

5. Both saltwater and freshwater fish have adaptations to control the movement of water and salts across their external surfaces. Describe what would happen without these adaptations.

6. How would the process of natural selection favor the evolution of increased salt tolerance during the decades that cold regions of the world have increased the use of road salt, which ultimately finds its way into streams and lakes?

7. Using your knowledge of how CO2 dissolves and reacts in water, explain why global increases in atmospheric CO2 should cause a decrease in the pH of ocean water.

8. How would counter-current selection in fish gills be beneficial for an animal trying to get rid of CO2?

9. How might the use of isozymes permit an aquatic organism to persist with a gradual increase in thermal pollution but not a rapid increase in thermal pollution?

10. If the algae that live in corals need CO2 as a carbon source for photosynthesis, why do scientists argue that global increases in CO2 are playing a role in the decline in coral reefs around the world?

Background: In this assignment, you willinvestigate the chemical composition of the foods we eat as ourbodies break down food by the digestive process.

The USDA Nutrient Data Laboratory has posted a resourcethrough which you can investigate the chemical composition offoods. Go to the USDA Lab Link at USDA Nutrient DataLaboratory: http://ndb.nal.usda.gov/

Instructions

  1. Type in a keyword, then select a food group using the drop-downarrow, then click "submit."
  2. This pulls up a menu with lots of choices.
  3. Choose one food choice, then click "submit"
  4. Next choose a portion size, then click "submit"
  5. This will bring up the nutritional informationneeded to complete the assignment.

Example:

  • Keyword: Apple
  • Select Food Group: Fruits and FruitJuice
  • Apples, raw, with skin.
  • One medium

Assignmentdetails:

A. Nutrition: Analyze the nutritionalcomponents of the food you select; and in your own words, answerthe following questions using the USDA Nutrient Data Laboratory Website as listed in the unit Web resources:

  1. What was the food and portion size you chose?
  2. Describe its composition in terms of carbohydrates, lipids, andproteins.
  3. How many calories are in your food item? (Found in the Databaseas Energy – kcal)
  4. List some of the most common vitamins and minerals in this fooditem.
  5. Are there other important nutritional components of this fooditem? If so, list these. If not, say so.

B. Water:

  1. How much of your food item is water?
  2. Provide one reason why water is important for life. Toadequately answer this question, it will be necessary to explain areason for water’s importance based upon its chemical and /orphysical properties.

C. Biological Molecule:

  1. State the most abundant category of biological molecule in yourfood: carbohydrates, lipids, or proteins.
  2. Describe the structure of this type of molecule, and itsprimary function(s). This section will not be a one sentence answer.In order to adequately “describe†an entire category ofbiological molecules, you will need to briefly review their basicmolecular structures and functions.

D. Recommendation:

After identifying the nutritional components, discuss WHY youwould or would not recommend this food item as part of a healthy,nutritious diet. Be sure to use references and guidelines such asthe Food Pyramid and Recommended Daily Allowances to support yourrecommendations.

Hello, I am respectfully requesting help responding to the below discussion. I need to respond by applying the following:

Participate individually with meaningful and original comments in the dialogue of the posted discussion questions.

Ensure your posted content is written in your own words. Repetitive (redundant) answers, copied articles or portions of articles from Web sites, books, magazines and so on will not count towards participation

Cite properly and consistently and include all sources used for your responses

I choose pollution. Pollution comes in many forms whether its air pollution, water pollution, and land/soil pollution. Air pollution is caused by gases and toxins that come from factories. Water pollution is caused by oil spills or trash that people throw into the water, and soil pollution is caused by industrial waste that affects soil from getting its essential nutrients. All kinds of pollution can be harmful to plants, animals, and humans. Air pollution is the main pollutant in everyday life. Things such as cars, planes, power plants, and other human activities produce air pollution. "Pollution disturbs our ecosystem and the balance in the environment. "Water pollution not only harms the aquatic beings but it also contaminates the entire food chain by severely affecting humans dependent on these. Water-borne diseases like cholera, diarrhoea have also increased in all places." A solution for the pollution would be having a big fine for people that pollute, fix the cars, planes, and power plants to where they don't give off carbon dioxide, and find a way to prevent oil spills into the ocean. Some other solutions for each would be:

Air Pollution:

"Seek advice from environmental professionals when locating exhaust outlet"

"Use smokeless fuel, such as gas and electricity"

"No outdoor cooking, e.g. hotpot & BBQ"

Water Pollution:

"Remove the accumulated bottom sludge regularly"

"Engage registered grease trap waste collector for regular cleaning and overhauling of grease trap"

"Keep an updated drainage plan in management office"

"Check the drainage plan before carrying out of drainage works to ensure correct drainage route

Pollution: Causes and Effects. (2016, December 24). Retrieved December 05, 2017, from https://www.conserve-energy-future.com/pollutiontypes.php

15 Current Environmental Problems That Our World is Facing. (2016, December 24). Retrieved December 05, 2017, from https://www.conserve-energy-future.com/15-current-environmental-problems.php

Pollution Problems & Practical Solutions. (n.d.). Retrieved December 05, 2017, from http://www.epd.gov.hk/epd/english/greenproperty/poll_pro/poll_pro_rec.html

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