Asap how do surface and deep currents work together to cause ocean water to circulate?

Can someone me with 3 and 4 plz. this is for masteries test.

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.

Chromosome 17 is made of over million base pairs.