Final answer:
The longer narrower part of the capsule shell is known as the shoulder.
Step-by-step explanation:
The longer narrower part of the capsule shell is known as the shoulder.
In biology, a capsule is a structure that surrounds and encloses certain organisms, such as bacteria or some plants. The capsule is typically composed of two parts: the cap and the body. The cap is the shorter, wider part of the capsule, while the body is the longer, narrower part. Therefore, the correct answer to the question is shoulder.