Final answer:
High Blood Pressure (Hypertension) and Adequate Hydration are predisposing factors to thrombus formation, while Low Blood Cholesterol Levels and Regular Exercise are not.
Step-by-step explanation:
Thrombus formation in the circulation can be influenced by several predisposing factors. High Blood Pressure (Hypertension) can cause vessel damage to the endothelial lining, activating the clotting mechanism. Adequate Hydration is important for maintaining normal blood flow and preventing venous stasis. On the other hand, Low Blood Cholesterol Levels and Regular Exercise are not considered predisposing factors to thrombus formation.