Which condition is a direct cause of surface currents a. wind forces b. differences in density c. high salinity d. uneven heating

keyword is surface - density, salinity n heating affect deep water

so ans is A. wind forces

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).