Many Amphibians (Including Many Frogs, Toads, and Salamanders) Spend the Early

question 49

Multiple Choice

Many amphibians (including many frogs, toads, and salamanders) spend the early part of their lives in water but live on land as adults. The adults of many species return to water to breed and lay their eggs. Frogs have small lungs and supplement their oxygen intake by breathing through the skin. Although large frogs have more total surface area than smaller frogs, the larger frogs have a lower surface area/volume ratio (less skin surface relative to their total body volume) . To keep their respiratory surfaces moist, frogs are generally found in wet or very moist locations.
In an experiment designed to investigate oxygen consumption in relation to body size, frogs from five different species were weighed and placed in a respirometer (a machine that measures oxygen consumption) for 1 hour. The table shows the results of the experiment.
$$\begin{array} { | c | c | c | } \hline \text { Species } & \begin{array} { c } \text { Average Weight } \\\text { (grams) }\end{array} & \begin{array} { c } \text { Oxygen } \\\text { Consumption in } \\\text { One Hour (cc) }\end{array} \\\hline \text { A } & 7 & 0.35 \\\hline \text { B } & 11 & 0.55 \\\hline \text { C } & 15 & 0.75 \\\hline \text { D } & 21 & 1.05 \\\hline \text { E } & 37 & 1.85 \\\hline\end{array}$$
-From the data in the table, it is reasonable to conclude that

• A) smaller frogs consume less oxygen per gram of body weight.
• B) each tested species consumes a different amount of oxygen per gram of body weight.
• C) oxygen consumption per gram of body weight is the same for all tested species.
• D) oxygen consumption per gram of body weight for the largest species is much higher than that for the smallest species.

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