Humans usually attain an adult level of visual acuity at about

A dummy used to help surgeons learn how to insert a pacemaker has high psychological fidelity. This means that:

A) the dummy looks like a real human, to make the training more realistic. B) the dummy is dissimilar from a real human because the surgeons do not need to be nervous about killing the dummy. C) the behaviors the surgeons need to execute to successfully insert the pacemaker are similar to what they would do for a human patient. D) the procedure for inserting the pacemaker is not very similar to how it would be done on an actual human.

What is emerging adulthood, and why do critics argue against calling it a "distinct period of development"?

What will be an ideal response?