Which leg bone provides mostly support for the skeleton?

a.
femur

b.
skull

c.
clavicle

d.
sternum
6.

(10 pt)
your vertebrae, or backbone, run along your back from the base of your skull to below your waist. the shape of each vertebra can best be described as:

a.
flat

b.
short

c.
irregular

d.
long
7.

(10 pt) your femur is a bone that starts at your pelvis and ends at your knee. its shape can best be described as:

a.
long

b.
short

c.
irregular

d.
flat

As a small change in a person's dna can cause a genetic disorder

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Moving down the ramp from 6 meters to