Alight microscope that makes the specimen appear light on a dark background is called a(n) compound microscope electron microscope dark-field microscope

The right option is; dark-field microscope

A light microscope that makes the specimen appear light on a dark background is called a dark field microscope.

Dark field microscopes are light microscopes that are used in different ways to clearly view various specimens that are unstained, transparent, and hard to see using a light field unit. Dark field microscopes are very effective because they show the details of unstained and live samples. It is also very simple to use, and inexpensive to set up.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.