What causes wind?
A ocean currents
Bdifferences in elevation

C Condensation in the atmosphere
D the uneven heating of the Earth by the sun

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?