For exercises 7 through 16. Use the following terms to complete the sentences or
_______________________ originate from the same ovum and are always of the
An increase in size is known as _______________________.
The ___________________ is the outer membrane of the two fetal membranes.
The _______________________ is a fleshy disklike organ.
The combined ovum and sperm. _______________________.
A sequence of events that normally includes fertilization, implantation, embryonic
growth, and fetal growth that terminates in birth. _______________________.
The joining together of the ovum and sperm cells is referred to as ____________.
A period of four weeks (28 days). _______________________
The result of pregnancies involving two or more fetuses is known as
_______________________ and _______________________.
Twins from two separate ova and sperm and may be of different sexes.