The male reproductive cell is called the _____________.

The very first cell of a new human baby is called a(n)_________________.

Human reproductive cell, either male or female is called a ____________.

The menstrual cycle in females repeats about every _______ .

The 38 weeks during which a fertilized egg develops is known as __________________.

The stage of development called___________ occurs the first 2 years of life.

Sperm cells develop in the ___________-.

Fertilization of the female egg occurs in the _______________.

Reproduction is the process that is essential to the continuation of life on Earth.

The testes produces a hormone called _____________, which helps sperm develop.

Mature eggs leave the ovaries and enter the ______________ where they might join with any sperm present.

A zygote moves from the fallopian tube and attaches itself to the wall of the _______________.

If an egg is not fertilized, it travels through the fallopian tube and uterus and breaks down. It is removed from the body in a process called __________________.

The stage of development from 2 years through 12 years is called________________.

The stage after childhood is called ________________, during which bones, muscles, lungs, kidneys and the reproductive system continue to grow.

The_______________ is the time during which the reproductive system matures.

_____________ is the process that occurs later in adulthood, hair turns gray, wrinkles form in the skin, and bones become weaker.

________________ occurs after adolescence.

An embryo develops into a(n) __________, which is the last stage before birth.