Which part of the cell is semipermeable, or controls what enters and leaves the cell?

The right answer is cell membrane.

The cell membrane plays, through permeability, an important role in exchanges and transport between the cell and its environment. It consists of lipids (phospholipids, cholesterol), proteins (proteins associated with membranes) and carbohydrates. It distinguishes the cytoplasm of a cell, protecting it from the external environment.

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.

i believe it is c: genes for body color and wing size are inherited separately from each parent.