Find the active and passive articulator of the two consonants m and d

The active articulator for the consonant /m/ is the lower lip, which moves towards the upper lip to create a complete closure. The passive articulator is the upper lip, which remains stationary.

The active articulator for the consonant /d/ is the tip of the tongue, which touches the alveolar ridge just behind the upper front teeth. The passive articulator is the alveolar ridge itself.