The atmosphere is held together by
a. the greenhouse effect
b. solar radiation
c. ozone
d. gravity

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Describe the function of the endomembrane system? what organelles are involved?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.