Which of the following statements about the first scuba diving suit is true?

a. it weighed about 100 pounds

b. it was made in the 1950's

c. it weighed about 50
pounds

d. it was made in the 1870's

hope this !

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.

b. to discover aspects of the natural world.

hopefully i .