2); probably this variability is due to different degrees of development in individual frogs rather than to interspecific differences. [Please select]
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San Marcos, Guatemala) effort was made to determine what, if any, ecological interspecific relationships existed. [Please select]
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Could interspecific hybridization between "good species" of _Microtus_ take place in nature and possibly alter the characteristics of a local population. [Please select]
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McGibbon (1945) was able to distinguish the red cells of interspecific hybrids in ducks by similar methods. [Please select]
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