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The first menstrual period, which usually occurs at approximately age 13, is called ?

The helmet-like region of the sperm that is similar to a large lysosome and assists penetration of the egg is called the?

Emily pokes her sister Libby while she’s sleeping, causing Libby to roll over. Libby’s reaction, even though she did not think about moving, is an example of __________.

Katelin was involved in a serious car accident, but was luckily not injured. Years later, she can still vividly remember many details of the car crash even though the rest of that day’s activities are only a blur. This is an example of a flashbulb memory.

The top of the lungs is known as the 

Sperm are formed in tightly coiled tubes called seminiferous tubules that are found within each?

From superior to inferior, the three regions of the pharynx are?

Where are the most nephrons located?

In males, the urethra is part of both the urinary system and?

During childbirth, which layer of the uterus contracts to force the baby out of the mother’s body?