Answer:
6 days
Explanation:
once the embryo reaches the Blastocyst stage, approximately 5-6 days after fertilization, it hatches out of it's zona pellucida and begins the process of implantation in the uterus.
<span>A.it increases the efficiency with which the body delivers oxygen and nutrients to its cells</span>
<span>Some of the factors that influence emotional changes throughout adolescence are: increased sensitivity to criticism, change in self perception, change in the manner in which adolescent are treated, increased desire for independent living, increased desire for social acceptablility, crisis with self-confidence, etc.</span>