The embryo inherits half its chromosomes from its mother. The embryo receives its food from its mother through the placenta. The embryo receives oxygen through the placenta. The embryo receives mutations carried by its mother.
I gave my students this multiple choice question: Which statement explains why a mother's unhealthy diet during pregnancy is harmful to her embryo's development?

Only one answer is correct among these 4 choices:
- The embryo inherits half its chromosomes from its mother.
- The embryo receives its food from its mother through the placenta.
- The embryo receives oxygen through the placenta.
- The embryo receives mutations carried by its mother.

Could you tell me which one is correct?

The embryo receives its food from its mother through the placenta.