When she was only 4-months-old, Abigail's mother could drop her off at day care without Abigail crying or becoming upset. Once Abigail turned 8 months, she began clinging to her mother, crying, and becoming very upset when her mother dropped her off. What concept explains Abigail's behavior?

object performance

Explanation:

The term "object permanence" is used to describe a child's ability to know that objects continue to exist even though they can no longer be seen or heard. It means her mother still exist even though she doesnt see her all the time.it requires the ability to form a mental representation

overview:

this is a technology-dependent lesson that students can guide at their own pace of exploration and learning. students share what they learn through the use of twitter (or alternative classroom sharing medium like todaysmeet). the use of a social sharing platform like twitter gives students a place for sharing with a wider audience, for more effective means of communication with each other, for incorporating viewpoints from all students in the classroom, and a means to reference thinking and learning by the use of a hashtag at a later time. students will understand the role the allied air forces played in the normandy invasion. teachers can use this as a stand-alone lesson or offer more structure by guiding students through each source, one by one. teachers may learn more about the eighth air force by accessing the abmc’s strategic bombing campaign interactive.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."