What does the word catkins mean in the sentence below? Catkins dangled from the branches of the oak tree.

A-a type of colorful bird
B-animals that carry pollen
C-the sweet juices of flowers
D-clumps of flowers that hang from trees

Which of the following is an example of how the principle of beneficence can be applied to a study employing human subjects? providing detailed information about the study and obtaining the subject's consent to participate. ensuring that the selection of subjects includes people from all segments of the population. ensuring that persons with diminished autonomy are protected. determining that the study has a maximization of benefits and a minimization of risks.