Which phases of mitosis are the most difficult to distinguish? Why?

Since prophase and prometaphase are difficult to distinguish; classify the cells as prophase

DNA is the most difficult to visualize at prophase stage of mitosis.

Explaination: At prophase stage,no well defined chromosomes are present. DNA is present in the form of thin chromatin fibers that are difficult to visualize under microscope.

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.

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