1. At the point of implantation, which of the following occurs? A gastrula embeds into the uterine lining.
A blastocyst embeds into the uterine lining.
A gastrula embeds into the ovarian lining.
A blastocyst embeds into the ovarian lining.

2.The outermost germ layer of an embryo is damaged during development. This is likely to affect which of the following?

Formation of the skeletal and muscular systems
Formation of the respiratory and digestive systems
Formation of the nervous and integumentary systems
Formation of the circulatory and nervous system