Circle the letter of each sentence that is true about bringing up groundwater.

a. Most wells are dug with well-digging equipment.

b. A spring is a place where groundwater flows out of
cracks in rock.

c. For a well to work, the bottom of the well must
reach into the unsaturated zone.

What is genetic variation? -(a) each individual in a population has slightly different genes. -(b) some individuals in a population have more genes than others. -(c) each population of a species has slightly different genes. -(d)some populations of a species have more genes than others.