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lana [24]
3 years ago
13

A researcher wonders whether an acidic environment affects the growth of frogs. She varies the pH in five different tanks contai

ning ten tadpoles each, and measures the length of the frogs after one year. All frog tanks are provided the same amount of food. What is the dependent variable in this experiment
Select one:a. length of frogs
b. number of tanks
c. amount of food
d. pH of the tanks
Biology
2 answers:
Andre45 [30]3 years ago
8 0
A the length is DEPENDENT on the pH level
Montano1993 [528]3 years ago
8 0
The answer is d pH of the tanks
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Answer:

When analyzing data on the nitrogenous base content of the DNA of various species, the claims are supported by the data:

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  • <em>In any one species, the amount of guanine closely approximates that of cytosine.  </em>
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<em>(options A, B and D)</em>

Explanation:

Organizing the data has to:

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Yeast                   31.3        32.9       18.7         17.1

Herring                27.8       27.5       22.2       22.6

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E. Coli                  24.7       23.6        26.0      25.7

DNA is the molecule that contains the genetic information of each species, formed by sequences of nitrogenous bases Adenine, Thymine, Cytosine and Guanine.

Since Adenine and Thymine -as well as Cytosine and Guanina- are complementary, the percentage of them will be very similar in each DNA molecule.

The genetic information -which determines the physical and functional characteristics of each organism- is encoded in the DNA and is different for each species, so the percentages of nitrogenous bases vary from species to species.

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