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Attached are some multiple choice questions that I am struggling with off a recent assignment. If I could receive

some help I would appreciate it. The image attached is for question 6.

Freshwater fish excrete nitrogenous wastes as ammonia, a molecule that can be toxic in high concentrations. Which of the following statements is NOT true about their excretion of ammonia? (2 points)

Question 1 options:

1)  Ammonia is the easiest, lowest energy nitrogenous waste to process and excrete.

2)  Ammonia can be stored safely in the fishes' cells until it is able to be excreted.

3)  Fish live in an aquatic environment, a habitat that is well suited for the disposal of ammonia.

4)  Fish use the water constantly passing through their gills to excrete the toxic ammonia rapidly.

Question 2 (2 points) 

Organisms employ a variety of evolutionary adaptations to help them maintain the chemical composition of body fluids. Which of the following is NOT an example of how a given organism maintains such a balance? (2 points)

Question 2 options:

1) Some marine invertebrates are osmoconformers; their body fluids are isosmotic with the surrounding environment.

2) Many marine vertebrates offset osmosis by drinking large amounts of water and releasing salt through their gills.

3) Freshwater fish counteract osmosis by drinking large amounts of water and limiting their urination and feeding.

4) Terrestrial organisms reduce water loss with adaptations such as skin, waxy exoskeletons, and closable stomata.

Question 3 (2 points) 

A marine invertebrate was accidentally placed in fresh water and eventually died. Analysis will probably show that it died because its (2 points)

Question 3 options:

1) cells dehydrated and lost the ability to regulate water levels

2) cells took in too much water and could not osmoregulate

3) contractive vacuoles eventually ruptured from excess water intake

4) kidneys could not handle the sudden change in ion concentration

Question 4 (2 points) 

Rabbits were introduced into Australia more than 100 years ago, and their populations have increased greatly since that time. All of the following may be true of the rabbits in Australia EXCEPT (2 points)

Question 4 options:

1) the rabbits are successful at competing with native herbivores for food

2) the rabbits have not been able to find a niche in this new habitat

3) there are few effective predators of rabbits native to Australia

4) there are few pathogens or parasites that affect rabbits in Australia

Question 5 (2 points) 

An ectotherm is more likely to survive for an extended period of food deprivation than an equally sized endotherm in a survivable cold environment. This is because the ectotherm (2 points)

Question 5 options:

1) expends more energy per gram of body mass than does the endotherm

2) invests less energy in temperature regulation than the endotherm

3) maintains a higher metabolic rate than does the endotherm

4) metabolizes its stored energy more readily than the endotherm

Question 6 (2 points) 



Examine the figure above. The countercurrent arrangement of the artery and vein (2 points)

Question 6 options:

1)  facilitates heat transfer from the artery to vein, minimizing the difference in temperature

2) increases the need for insulation to minimize the amount of heat lost to the environment

3) optimizes the amount of heat able to be absorbed from the surroundings

4) reduces the ability of heat conduction, insulating each vessel to prevent heat loss


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