What would be the primary reason for an emt to change gloves between contact with different patients?

What causes darkening of the skin as melanin production increases

When plants use sunlight to make food, the energy of sunlight is

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