Twenty-Three Percent of High School Girls and 16% of Boys

question 34

Multiple Choice

Twenty-three percent of high school girls and 16% of boys

• A) use either withdrawal or no contraception at all.
• B) are at high risk for pregnancy.
• C) are at high risk for sexually transmitted diseases.
• D) All of these apply.

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Definitions:

Human Blastocyst

A stage of human embryonic development that occurs approximately 5 to 9 days post-fertilization, characterized by a sphere of cells enclosing a fluid-filled cavity and the inner cell mass that will develop into the embryo.

Gastrula

An early stage in embryonic development where the embryo consists of layers of cells (ectoderm, mesoderm, and endoderm) that will develop into different organs and tissues.

Germ Layers

The three primary layers of cells (ectoderm, mesoderm, and endoderm) in the early embryo from which all tissues and organs develop.

Fertilized Egg

A fertilized egg is the result of the fusion of a male sperm cell and a female ovum, marking the beginning of a new organism's development.