On some early automobiles both headlights failed when one bulb burned out. the headlights were likely connected in

Series.

Explanation:

In the series combination, the each component is connected through a single path and the current flow through the circuit is same but the voltage is dropped across each component and the overall voltage will be the sum of all the component's voltage.

In this type of circuit every component is connected to each other if one bulb is burn out then all the circuit will fuse.

Therefore, the headlights of few early automobiles failed when one bulb burned out because those headlights were connected in series circuit.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

a is the best answer your welcome