Which theory, proposed by Alfred Wegener, became the foundation for the theory of plate tectonics?

A. theory of spontaneous generation

B. theory of natural selection

C. the big bang theory

D. theory of continental drift

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of