Convection is the transfer of heat from
a. warmer objects to cooler objects in liquids and gases.
b. cooler objects to warmer objects in liquids and gases.
c. cooler objects to warmer objects by direct contact.

A. warmer objects to cooler objects in liquids and gases

warmer objects to cooler objects in liquids and gases

explanation:

The natural convection is a process, in which the fluid movement occurs from heat transfer. When a fluid is warmed or chilled, its density changes and the buoyancy effect create a natural flow in the affected region, which makes itself the rise of hotter fluid and the fall of cooler fluid: hence, energy transfer from hotter area to colder area and such process is repeated as long as the temperature variation in fluid exist.

Your weave is crusty

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.