The correct answer is 1 second. A period is a physical term which describes the time needed for one cycle of vibration to complete and reach a certain point. In this example, the term period refers to the time needed for one complete heartbeat to occur. Since 60 heartbeats occur in 60 seconds, then one heartbeat needs 1 second to complete.
Eagles evolved better over the years to hunt their targets easier, which explains why they have sharp talons, they instinctively use them to hunt their prey.
