Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

تمرين 7

The time from conception to birth is called the (a) _____ period, which is divided into three parts. The two-week period that immediately follows conception is called the (b) _____ period; it is marked by the zygote dividing into many cells. The period that includes the 2-8 weeks after conception, during which cells continue to divide and begin to differentiate into bone, muscle, and body organs, is called the (c) _____ period. The period of development that begins two months after conception and lasts for about seven months is called the (d) _____ period. At the end of this period, birth occurs and the fetus becomes a newborn.