Increase and decrease in oestrogen and progesterone.
The term apomorphy means a specialized or derived character state; plesiomorphy refers to a primitive or ancestral trait. An same as autapomorphy is a derived trait that is unique to one group, while a same as synapomorphy is a derived trait shared by two or more groups.
No. At that point, you need to determine if the problem lies in the control or the staining reagents or techniques.
The answer is through the Plasma Membrane