If you were to compare an obese and a normal sized rat, you would conclude that:

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Restating the question and options to ensure clarity: If you were to compare an obese and a normal sized rat, you would conclude that:

Option 1: The metabolic BW of the obese rat is higher than the normal rat
Option 2: The metabolisable energy requirement of the obese rat is higher than the normal rat
Option 3: The metabolic BW of the obese rat is lower than the normal rat
Option 4: Their metabolic BW are the same

Option 1 analysis: This statement aligns with the general principle that absolute metabolic rate (and thus metabolic body weight, which scales with body size) tends to be greater in larger animals. An obese rat has a greater body mass, so its metabolic BW, which reflects the amount of metabolism tied to body size, would be higher in absolute terms than a normal-sized rat. This is consistent with allometry where metabolic rate increases with body size, albeit not linearly.

Option 2 analysis: The metabolisable energy requirement (often the energy intake needed to maintain body weight) is typically higher in a larger animal due to increased tissue mass and maintenance costs. However, the statement needs to reflect whether it is higher strictly because of body size; while it is plausible that energy requirement is higher for an obese rat, this option is less precise because it contrasts directly with the notion of metabolic BW and focuses on energy intake rather than the metabolic scaling concept. Depending on context, this could be true, but it is not the most direct inference about metabolic body weight itself.

Option 3 analysis: This states the opposite of the expected relationship. If the obese rat is larger, its metabolic BW should not be lower; metabolic output scales with size, so a lower metabolic BW for a bigger animal would contradict basic allometric trends. This option is generally incorrect given standard metabolic scaling.

Option 4 analysis: This claims equality of metabolic BW between the two rats. Since metabolic BW is tied to body size, a significant difference in body mass (obese vs. normal) typically implies a difference in metabolic BW. Therefore, asserting they are the same ignores scaling relationships and is unlikely to be correct.

Synthesis across options: Considering the standard concept that metabolic body weight increases with overall body size, the obese rat, having greater body mass, would exhibit a higher metabolic BW in absolute terms than the normal-sized rat. While option 2 addresses energy requirements, option 1 directly references metabolic BW and aligns with scaling principles. Options 3 and 4 violate the expected size-metabolism relationship, making them less plausible in this comparison.

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If you were to compare an obese and a normal sized rat, you would conclude that:

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