Which of the Following Statements Is True About the Period

Multiple Choice

Which of the following statements is true about the period of the zygote?

A) It lasts from implantation to the eighth week of pregnancy.
B) During this period, the primitive brain and spinal cord appear.
C) During this period, the blastocyst burrows into the uterine lining.
D) It spans the first and second trimester of pregnancy.