Biology 34.4

Multiple Choice

The first stage in the formation of the nervous system is called

• gastrulation

• neurulation

• implantation

• fertilization

Multiple Choice

The connection between the mother and the embryo that acts as the embryo's organ of respiration, nourishment, and excretion is the

• Placenta

• amnion

• chorion

• notochord

Multiple Choice

The fetus is connected to the placenta by the

• uterus

• umbilical cord

• chorion

• Fallopian tube

Multiple Choice

Siblings that develop from two eggs that were released at the same time but were fertilized by different sperm are

• idential twins

• triplets

• fraternal twins

• paternal twins

Multiple Choice

During which stage of pregnancy is drinking alcohol most likely to cause neurological problems in the fetus?

• fertilization

• neurulation

• implantation

• gastrulation