Acapsule stain is described as a negative stain because the capsule itself does not take up stain has a negative charge. stains with an acidic dye

Does not take up the stain.

Explanation:

Negative staining refers to the process wherein the unstained specimen is visualized under the darkly stained background.

One of the examples is capsule staining wherein the capsulated cells are stained with India ink or nigrosin dyes. The particles of these dyes stain the background blue-black but cannot enter the capsule.

Hence, the light-colored capsulated cells are visualized in the midst of the blue-black background.

c. is the correct answer

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.