Arctic foxes have white fur in winter and brown fur in summer. What type of adaptation is this, and what advantage does it provide?
ABehavioral — they choose to change color
BStructural — their fur color changes seasonally to provide camouflage in each season
CPhysiological — they produce different hormones in winter
DIt is not an adaptation — it is a coincidence
The seasonal color change is a structural adaptation. White fur in winter camouflages the fox against snow, and brown fur in summer matches the tundra landscape after snow melts. This camouflage helps the fox avoid predators and sneak up on prey in both seasons. While hormonal changes trigger the color shift (physiological), the adaptation itself — having fur that matches the environment — is structural.
Question 2 True / False
Organisms develop new adaptations during their lifetime when they need them.
TTrue
FFalse
Answer: False
Adaptations do not develop on demand. They arise over many generations through natural selection. Organisms are born with their traits — they cannot grow a new structure or develop a new ability because they need it. What changes over time is the population: individuals with advantageous traits survive and reproduce more, so those traits become more common in future generations.
Question 3 Short Answer
Give one example each of a structural, behavioral, and physiological adaptation.
Think about your answer, then reveal below.
Model answer: Structural: A duck's webbed feet help it swim efficiently. Behavioral: Birds migrating south for winter to find food and warmer temperatures. Physiological: A camel's ability to tolerate body temperature fluctuations without sweating, conserving water in the desert.
These three categories cover the range of how organisms can be adapted. Structural adaptations involve body parts, behavioral adaptations involve actions, and physiological adaptations involve internal body processes. Many organisms combine all three types to survive in their environment.