The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.
Animal $\quad$ Gestation period
The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.
Animal $\quad$ Gestation period
- A
Dog $60$ $\quad$ - $65$ days
- B
Elephant $607$ $\quad$ - $641$ days
- C
Cat $52$ - $65$ days
- D
Cow $330$ - $345$ days
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