Question

What is the weight and height of a twelve-week-old human embryo?
A. $7.5{\text{ }}cm$, $650{\text{ }}gms$
B. $42{\text{ }}cm$ and $1800{\text{ }}gm$
C. $7.5{\text{ }}cm$, $14{\text{ }}gm$
D. $32{\text{ }}cm$, $650{\text{ }}gm$

Answer 1

The many stages of embryo development are referred to as embryo development. Plants and mammals have different embryonic development. Even in mammals, various stages of embryonic development occur in different species. The study of embryo development is known as Embryology. This covers the transformation of a single-cell embryo into a child. The human foetus gains weight and height gradually over the course of $9$ months of pregnancy.

Complete answer:
Option A: Human embryos at around $24 - 25$ weeks measure $32{\text{ }}cm$ in length and weigh $650{\text{ }}gm$.
So, option A is incorrect.
Option B: Human embryos at around $32$ weeks measure $42{\text{ }}cm$ in length and weigh $1800{\text{ }}gm$.
So, option b is incorrect.
Option C: Human embryos at $12$ weeks have grown all major organs, including muscles, bones, toes, fingers, and sex organs. It is $7.5{\text{ }}cm$ in length and weighs $14{\text{ }}g$.
So, option C is correct.
Option D: Human embryos at around $24 - 25$ weeks measure $32{\text{ }}cm$ in length and weigh $650{\text{ }}gm$.
So, option D is incorrect.

So, option C is the correct answer.

Note:
To summarise, the heart is the first organ to begin to function. The heart begins to develop after the first month of pregnancy. In the second month, limbs and digits emerge. All of the major organ systems develop by the end of the first trimester or third month. The genital organs are clearly apparent. During the fifth month, the embryo begins to move and hairs begin to form on the head. Eyelashes are developed, eyelids separate, and the body is covered in fine hair towards the end of the second trimester. The foetus is completely developed and ready for birth by the end of the ninth month.