Gestation period is the duration

Gastrulation is the process which involves the differentiation of the following layers in a vertebrate embryo.

Placenta acts as an endocrine tissue and produces several hormones like:
$A.$ Human chorionic gonadotropin $(hCG)$
$B.$ Human placental lactogen $(hPL)$
$C.$ Estrogens
$D.$ Progesterone

Primary ectoderm during gastrulation develops from . . . . . . .

Which animals have a higher chance of survival for their young offspring?

Which of the following is a correct function of the placenta?