Which of the following is an example of heat transfer by convection? a. holding a hand warmer b. warming your hands in front of a fire c. sitting in the sun d. air rising over the lands as it is heated

D. Convection heat transfer is caused within a fluid by the tendency of getting hotter and that causes less dense material to rise and colder material to sink caused by gravity, which results in convection heat transfer. Hope this helps 

To wear the full equipment.

Both of them have a nucleus, golgi apparatus, cell membrane, smooth and rough endoplasmic reticulum, lysosome, and ribosomes.