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If the opportunity cost of producing more of one good remains the same as more of that good is produced, then the production method is inefficient.
Three-chambered Heart
A type of heart structure found in amphibians and some reptiles, consisting of two atria and one ventricle.
Amphibians
A class of cold-blooded vertebrates that includes frogs, toads, salamanders, and newts, which typically have a life cycle that includes both aquatic (larval) and terrestrial (adult) stages.
Birds
Warm-blooded vertebrates that are characterized by feathers, beaks, and laying hard-shelled eggs, and they have a high metabolic rate and a lightweight skeletal system.
Monotremes
A group of egg-laying mammals that includes the platypus and echidnas.
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