Imagine that this is the first time you have seen a clam. From the observations you have made what evidence would indicate whether this animal is aquatic or terrestrial?

Observing a clam for the first time, I would note its soft body enclosed within a hard shell, which suggests a protective adaptation. Its habitat, such as being found in water or mud near a shoreline, would indicate its environment. Additionally, the presence of gills, used for respiration and filtering water, would strongly suggest it is an aquatic animal. If it exhibited movement through water or burrowing in sand, these behaviors would further confirm its aquatic nature.