34 Select the correct answer.
Which of the following muscles inserts on the phalanges?
ОА.
Extensor digitorum
OB. Extensor carpi radialis longus
OC.
Extensor carpi ulnaris
OD
All of the above

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.