Question

how was the contracting of the bodys arteries helpful to early humans? it helped them stay alert to detect any danger. it helped them run fast to reduce their blood flow. it helped them stand still to feed large animals. it helped them think cleverly while hunting.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Arterial contraction (part of the body's stress response) increases alertness, which is vital for early humans to detect danger. This makes sense.
• Option 2: Running fast would increase blood flow, and arterial contraction doesn't primarily help with running fast to reduce blood flow. This is incorrect.
• Option 3: Standing still to feed large animals is not a typical or helpful scenario related to arterial contraction. Arterial contraction is more about stress/alertness, not feeding. This is incorrect.
• Option 4: Arterial contraction is related to physiological responses (like alertness, blood pressure regulation) rather than directly helping with "thinking cleverly" during hunting. Alertness (from option 1) is more relevant. This is incorrect.

Answer:

A. It helped them stay alert to detect any danger.