Why is the largest single cell organism only 5cm

Biologists used the world's largest single-celled organism, an aquatic alga called Caulerpa taxifolia, to study the nature of structure and form in plants. It is a single cell that can grow to a length of six to twelve inches.

The remaining cells can divide and make new cells to heal the wound. But an organism made of one large single cell will die from even a small wound, because the inside contents of its single cell will leak out and it has no backup cells to preserve its life therefore cells can't be that large in size.

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the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.