During gestation, embryos normally develop in

During gestation, embryos normally develop in humans which happen in the eleventh week. An embryo is then called a fetus in a more advanced stage of development. Unlike humans, animals which develop in eggs outside the mother's body would be then called as chick embryo.

The missing word in the sentence above is humans. 

~potters6/te801/biology/biounits/respiration.htm

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun