Explain how the actions of the inspiratory muscle creates a pressure gradient that allows air to enter the lungs?

Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an