Final answer:
The identifying marks of the sea beast include ringlets across its body, inscriptions in cuneiform, and the presence of five legs. When viewed from different angles, the sea beast appears to be both stationary and moving.
Step-by-step explanation:
The identifying marks of the sea beast include ringlets across its body, inscriptions in cuneiform under the creature and around its legs, and the presence of five legs, with two in the front and four from the side. When viewed from the side, the sea beast appears to be moving forward, but when viewed from the front, the two front legs are static, giving the impression of a stationary guardian figure at a gate.