As they view inside-the-body footage, they explore the digestive, reproductive, circulatory, urinary, endocrine, respiratory, skeletal, lymphatic, and nervous systems.
(they; view; inside-the-body footage) (they; explore; the digestive, reproductive, circulatory, urinary, endocrine, respiratory, skeletal, lymphatic, and nervous systems)
they they
view explore
inside-the-body footage
the digestive, reproductive, circulatory, urinary, endocrine, respiratory, skeletal, lymphatic, and nervous systems