Vertical structural members that exterior wall sheathing and siding may be attached to are called:

The Answer is Studs.

Vertical structural members are called Studs. This is the term which is used in construction. There are exterior and interior walls which are framed, these walls are known as bearing walls, and some are also non- bearing. Whenever there is foundation in a place, after the first floor deck these bearing walls are formed.

fertilization is the union of an egg and a sperm cell i believe.