What early 1900s development using sound waves made mapping the topography of the ocean floor easier a) magnetometry technology b) sonar technology c) wegener’s technology d) pulse-and-bounce technology

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