What muscle contracts and relaxes when you inhale and exhale? a. tricep
b. lung
c. diaphragm
d. bicep

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Describe the layers of the suns atmosphere?

The term autotroph refers to an organism that: a. uses co2 for its carbon source. b. must obtain organic compounds for its carbon needs. c. gets energy from sunlight. d. gets energy by oxidizing chemical compounds. e. does not need a carbon source