What do you call the muscle beneath the chest cavity that contracts and expand during breathing?

During weight training, when should you exhale? (hope) a. on the lift b. on the recovery c. before the set d. after the set

Different plant and animal species have a great variety of body structures that them survive and reproduce. which of the following is also true? a. the individual cells of plants and animals cannot perform specialized functions. b. the individual cells of plants and animals function in very similar ways. c. the individual cells of plants and animals do not share any similarities. d. the individual cells of plants and animals do not contain genetic information. reset submit

Aspeed limit sign that says "night" indicates the legal speed between sunset and sunrise. a. minimum b. maximum c. only d. average