Growth and Development - Chapter 23, Part 1

What is the main reason why sperm need to be in the middle of the pack during fertilization?

• They need to avoid the acidic environment.

• They need to wait for other sperm to dig through protective layers.

• They need to be the first to reach the egg.

• They need to find the right ovarian tube.

What is the term for the hollow ball of cells that implants into the uterine lining?

• Gastrula

• Zygote

• Morula

• Blastocyst

What is the primary function of the placenta?

• To produce hormones for the mother

• To provide a place for the embryo to grow

• To help the embryo develop organs

• To protect the embryo from the mother's immune system

How do fraternal twins form?

• Two embryos merge into one.

• One sperm fertilizes two eggs.

• Two eggs are fertilized by two different sperm.

• One egg splits into two embryos.

What is a unique characteristic of mirror twins?

• They are always conjoined.

• Their internal organs are mirror images of each other.

• They share the same placenta.

• They have identical birthmarks.