Final answer:
The consonants /g/ and /d/ differ in their place of articulation, with /g/ being velar and /d/ being alveolar. Both are voiced plosives, produced with vocal cord vibration, but they are articulated in different areas within the vocal tract.
Step-by-step explanation:
The consonants /g/ and /d/ differ in terms of place of articulation. The consonant /g/ is a velar plosive, meaning it is produced by obstructing airflow in the vocal tract with the back of the tongue against the soft palate or velum. In contrast, the consonant /d/ is an alveolar plosive produced by obstructing airflow with the tongue against the alveolar ridge just behind the upper front teeth. Although both of these sounds are voiced, meaning the vocal cords vibrate during their production, the main difference lies in their place of articulation, not voicing or manner.