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maksim [4K]
3 years ago
5

Scientists discovered a new species of freshwater fish that lives in a pond with a very low O2 level. When they measured the oxy

gen extraction efficiency of the fish, it was twice as high as that of closely-related fresh water fish. Propose a hypothesis to explain how the fish achieve a high O2 extraction efficiency
Biology
1 answer:
AysviL [449]3 years ago
8 0

Answer:

In order to propose a hypothesis, there is a need to first see the function of gills in fishes. The gills of fishes comprise blood vessels that exhibit inherited tendencies of getting oxygen out of the water, which was consumed by fishes from their mouths. These gills also comprise thin walls, and when water moves over these walls of blood vessels, the oxygen from water moves into the blood, and then this oxygen-enriched blood goes to various organs.  

Thus, one of the hypotheses in the given case, can be the number of blood vessels, which are found in the gills of the mentioned freshwater fish to be higher in comparison to the blood vessels found in the normal fishes, and apart from this, the surface area of the thin walls, which are found in the gills is also more in the new species of freshwater fish.  

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2 years ago
Which is an example of scientific evidence that can be used to critique a new scientific argument?
Margaret [11]
When we perform a study, we test a specific hypothesis to see whether our hypothesis is supported by the data or not. If our hypothesis is not supported by the data, then we can argue that a specific argument (that would be important for this hypothesis) does not have a claim in scientific research. 

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6 0
3 years ago
A student decides to set up an experiment to see if detergent affects the growth of seeds. He sets up 10 seed pots. 5 of the see
Trava [24]

Answer:

The correct answer is option C) "More than one variable is being tested".

Explanation:

One of the basis of scientific experimentation is to test one variable at the time in order to make sure that the response that is being obtained is the result of that variable and not another one that is not taking into account. In this case, the student is making the mistake of assessing two variables at the same time: the use of detergent and placing the plant in the sun or in the shade. At the end of the experiment the student will not know if the response is the effect of the detergent, the exposure to the sun or a combination of both.

8 0
3 years ago
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Alan is a 47-year-old man who has no documentation of a primary series of tetanus-containing vaccine. Which of the following wou
Brrunno [24]

Answer:

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Explanation:

In general, Tdap is given before Td to all those adults who have never been administered with Tdap earlier.  

Also as per the publication of CDC, any individual who is of 7 years or older than this and has never been vaccinated by Td needs following schedule of medication  

a) First primary dose

b) After the first primary dose the second primary dose of Td must be given in 4 weeks and  

c) The third primary dose must be given after 6 to 12 months.

Hence, option D is correct

8 0
3 years ago
What type of ion channel is responsible for the depolarization phase of an action potential?
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The type of ion channels responsible for the depolarization phase of an action potential are Na+ (sodium) channels. Sodium ions flow inward through the sodium channels and cause an increase in the concentration of positively charged ions in the cell; this in turn, leads to depolarization.

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3 years ago
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