The period of development in the mother's body, lasting from ___ to birth is known as ___.
conception | gestation
gestation | conception
fertilisation | gestation
fertilisation | conception
In the ___ of gestation the developing offspring is described as ___.
first 2 months | embryo
last 2 months | embryo
first 2 months | fetus
first 4 months | fetus
The delicate structure of an embryo is ___, ___ and ___ by the ___ and ___ from early on in its development.
contained | supported | protected | amniotic sac | amniotic fluid
caged | supported | protected | amniotic bag | amniotic fluid
contained | supported | exposed | amniotic sac | amniotic juice
captured | supported | protected | abiotiic bag | amniotic fluid
The outer layers of the ___ of the ___ that grow and give rise to the ___ and ___.
tissues | embryo | membranes | placenta
cells | embryo | skin | placenta
tissues | fetus | membranes | placenta
cells | embryo | membranes | capillaries
By the end of 2 months' development, the beginning of the principal adult ___ can be detected and the placenta is ___; during the rest of ___ the developing offspring is called a ___.
organs | operational | gestation | fetus
hormones | separated | gestation | fetus
organs | broken | gestation | embryo
cells | operational | abortion | embryo