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Internal - they're mammals.
Platypus fertilisation occurs internally.
Several diagrams of the platypus - both external and internal - can be found at the related link below.
internal. the male needs to 'mate'with the female
how does the mourning show internal and external responses to its environment
reflexes
They are receptors.
internal external not internal external not
Responses or reactions we make or activities we engage in.- Association between stimulus (S) and response (R). - [(S) and (R) can be internal/ external]
its internal
The word behaviour (or US spelling, behavior) is an abstract noun; a word for the the aggregate of responses to internal and external stimuli.
Is a salmon internal or external?