Within a flock of birds, some birds have long narrow beaks, and other birds have short wide beaks. Environmental changes happen that make it harder for birds that have short wide beaks to find food. After several generations, most of the flock has long, narrow beaks. Which statement best describes the trait of the type of beak that a bird in this flock has?
Answer
A
Having a long, narrow beak is an inherited trait that is genetically passed down.
B
Having a long, narrow beak is an acquired trait that is determined by the availability of food.
C
Having a short, wide beak is an acquired trait that is found in birds that have learned to adapt to the environmental changes.
D
Having a short, wide beak is an inherited trait that is chosen by the bird as a result of its experiences.
Explanation
Birds with long, narrow beaks were more likely to find food and survive, so they could pass the genes for that beak shape to their offspring. Over generations, this inherited trait became more common in the flock. A beak shape is not acquired by an individual bird simply because food conditions change.
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