After four days of development, the zygote is known as a/an ________
A) gonad
B) gamete
C) embryo
D) fertilized egg
C
Explanation: A) A gonad is a testis or an ovary.
B) A gamete is an ovum or a spermatozoon.
C) Correct! A zygote is known as an embryo until eight weeks; then it is called a fetus.
D) A fertilized egg is the same thing as a fertilized ovum, but after four days they both have a different name.
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