Answer:
A
Explanation:
As the species seperated they formed a differnt beak based on what they ate.
Answer:
D
) ratio of neutrons to protons in each element.
The studies are designed this way b/c it removes the power of suggestion and the double-blind study keeps both researchers and participants in the dark. So this compared to who is receiving the treatment which is relevant b/c it stops the researchers from accidentally overbalancing the study participants, or unintentionally favoring their assessment of the conclusions.
