Which of the following statements is true about Earth's crust? A) The Earth's crust is the thickest of all the layers
B) Earth's crust only moves during an earthquake
C) Earth's crust is always moving
D) The Earth's crust has magnetic properties

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.