In most mammals, the embryo obtains food substances from the mother via the O Yolk
O Amnion
O Placenta
Uterus

Explanation:

it is through the placenta.

it also protects the embryo from harmful substances

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.