The cluster of developing cells from conception until birth is called an

I believe it's "Embryo"

Explanation:

Hope my answer has helped you if not i'm sorry.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.