Which best describes the relationship of the embryo and the fetus?
the embryo and the fetus are both formed when the sperm and egg fuse.
the fetus differentiates into the embryo and the placenta.
the embryo has more cells than the fetus has.
the fetus is more developed than the embryo.

The correct answer is- The fetus is more developed than the embryo.

Embryo describes the early stage of human development that roughly corresponds to 5th to 10th week of pregnancy. It is developed from zygote ( produced when egg is fertilised by sperm) through a series of stages like blastula, gastrula, and then organogenesis.

On the other hand, fetus describes the later stage of human development that begins from the end of 10th week or beginning of 11th week of pregnancy and goes till the end of pregnancy. The various organs are fully developed during this phase.

Thus, fetus is more developed than the embryo.

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