Carbohydrates, lipids, proteins and nucleic acids are classes of ___ . The molecules are , which means they contain carbon. Subunits of these molecules are called and are connected together by . Word Bank:
organic, macromolecules, covalent, monomers

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

,

chris

c

explanation:

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.