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?
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.

The correct answer is option A.

Explanation:

According to the given question environmental changes made it difficult for the birds with short and wide beaks to find food due to which their gene pool disappeared after few generations.

Environmental changes favoured the birds with long and narrow beaks due to which this trait was passed on to their generations and after few generation-long and narrow beak birds will dominate the niche. This is an example of genetic drift where the population has shown the directional shift.  

Thus, option A is the correct option.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.