What is defined as an embryo?

The correct definition of an embryo refers to a fertilized egg during the early stages of development, specifically the first eight weeks after conception. During this crucial period, the embryo undergoes significant cellular division and differentiation, laying the foundations for all the organs and systems of the future fetus.

Understanding this definition is vital in discussions surrounding prenatal development, as it distinguishes the embryo from later stages of development, such as a fetus, which occurs from the ninth week onward. In contrast, fully developed fetuses or infants after birth do not meet the designation of an embryo, nor does the term apply to a woman who is pregnant. The focus on the early stages of cell development in choice B emphasizes the specific characteristics of an embryo that are essential in biology and relevant discussions in religious or ethical debates on issues such as abortion and reproductive rights.