A group of scientists wanted to investigate how populations of organisms can change over time. They decided to study a population of birds on the Galapagos Islands exposed to extreme conditions of drought. Which of the following would be the best hypothesis to test how the birds might adapt to these conditions over time?
A. Birds exposed to extreme drought will become less attractive over time.
B. Extreme drought conditions could cause bird species to become extinct.
C. If birds are exposed to extreme drought then their beak size will quickly change overnight.
D. Birds might breed with other species and adapt to these conditions.