What is the role macromolecules play in relation to life on earth

There are four types of macromolecule :

1)Carbohydrate

2) Protein

3) Lipids

4) Nucleic acids

Carbohydrate: They store energy, provide fuel and they are main buliding structurein body, main source of energy ,Structure of plant cell wall.

Nucleic Acids: DNA and RNA are nucleic acid , they store and transfer information .

Lipids: They store fats and energy . They are insulator.

Protein: They generally provide structural support , transport, enzymes , movements and defense.

So, these are the macromolecule which play important role in our life.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.