In a urine analysis,the presence of which of the following indicates pregnancy?

The figure below shows a human fetus within the uterus. Identify $P$ and $Q$.
$\quad\quad P \quad\quad\quad Q$

The pattern of cleavage in an egg is determined by which of the following?

Notochord,skeletal system and dermis of the skin are the derivatives of

The foetus develops its limbs and digits in . . . . . . during embryonic development.

$A$ : The morula passes through the phase of compaction,producing two major types of cells: the peripheral cells and the inner cell mass.
$R$ : The descendants of the inner cell mass become the trophoblast cells.