Which of the following examples shows how scientists continue to investigate darwin’s idea that species change over time by natural selection?

a. ornithologists study the wing shape and flight patterns of birds.
b. archaeologists uncover, catalog, and compare fossils of marine life.
c. microbiologists examine the reproduction rates of bacteria.
d. ecologists obtain samples of tree trunks to determine the trees’ ages.

i think the answer is b.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).