Asked by des

Scientists who study migrating organisms need a way to track the organisms' movement. They also need to determine the number of organisms in a certain location at a given time. This information helps scientists better understand changes in migration behavior.

Radar is a technology used by scientists to track smaller organisms like birds, bats, and flying insects during migration. For example, radar can detect the number of bats in a swarm of bats. The diagrams shown below represent how a signal is sent from a transmitter toward an object, such as a bird, and bounces back to the receiver.



The first diagram shows a transmitter and an arrow labeled 'signal sent out' pointing from the transmitter to a bird. The second diagram shows a receiver and an arrow labeled 'signal bounced back from bird' pointing from the bird to the receiver.





Radar tools used to track bird migrations come in both digital and analog forms. The chart below compares digital signals to analog signals.







Digital Signals Compared to Analog Signals

Comparison 1: Digital signals carry more information per second than analog signals.

Comparison 2: Digital signals maintain the quality of the information sent over greater distances than analog signals.

Comparison 3: Digital signals send information in a series of pulses in two states, on and off, rather than continuously (like analog signals).


One scientist makes the following claim:



Claim: Digital radar technology is better for tracking bird migrations than analog technology.



Which comparison supports the scientist’s claim AND explains why this compared characteristic helps monitor migrating birds?


Comparison 1
Explanation: Comparison 1 helps track birds that are spread out over a lot of distance.

Comparison 1
Explanation: Comparison 1 helps strengthen the message as it moves long distances.

Comparison 2
Explanation: Comparison 2 helps track birds that are spread out over a lot of distance.

Comparison 3
Explanation: Comparison 3 helps strengthen the message as it moves long distances.

All Answers 1

Answered by GPT-5 mini AI
Comparison 2 — Explanation: Comparison 2 helps track birds that are spread out over a lot of distance.

Reason: If digital signals maintain quality over greater distances, radar can reliably detect and resolve return signals from birds that are far away, letting scientists monitor migration over larger areas and longer ranges.