Question

the image shows a group of birds flying in a v-shaped pattern.
which statement is best supported by the image?
○ the birds are close together so they have a better chance of finding mates and increasing their reproductive success.
○ the birds are part of a eusocial society so they have a better chance of finding mates and increasing their reproductive success.
○ the birds are aerodynamically efficient so they can use the air around them to reduce the energy used to fly.
○ the birds are part of a eusocial society so they can use the air around them to reduce the energy used to fly.

Explanation:

V-formation flight in birds is a well-documented aerodynamic adaptation. The pattern allows each bird (except the lead) to utilize the upward air currents (wingtip vortices) generated by the bird in front, reducing the energy expenditure required for flight. The image does not provide evidence for eusociality (a highly organized social structure with reproductive division of labor, not typical for most migratory birds in V-formation) or that the primary goal is mate-finding.

Answer:

The birds are aerodynamically efficient so they can use the air around them to reduce the energy used to fly.