In plants the fertilized egg develops into a multicellular within a female gametangium.

Once fertilization has occurred, the embryo develops within the female gametophyte, and the ovule becomes the seed, complete with a food source (the gametophyte tissue) and a seed coat (the integument).

Once fertilization has occurred, the embryo develops within the female gametophyte, and the ovule becomes the seed, complete with a food source the gametophyte tissue and a seed coat (the integument).

Explanation:

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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.