The earths crust is
A. mostly made of iron and nickel
B. in motion because of convection currents in the mantle
C. Thicker under the ocean than under the continents
D. made of one large piece called the crustal plate

Abiology teacher asks students to give examples of genetic variations that support the idea that changes in a population’s environment affect genetic variation. which is the least supportive example? a.changes in genetics in human populationsb.antibiotic resistance in bacteria populationsc.pesticide resistance in garden insectsd.changes in the color of the peppered moth population in england