Which of these describes how heat is transferred by conduction
a. sunlight travels through space without the aid of fluids or solids
b. warm air rises and takes heat with it, eventually it cools and sinks
c. air at the equator rises and sinks at the poles
d. air molecules touch the warm ground, heating them up
hurry

The answer is D because as the molecules heat up by touching the ground the start to  transmission through impulses along nerves.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

d. cellulose and starch