Question

the picture below shows a diagram of a single - celled organism known as a euglena.
which structure acts in a manner most similar to skin tissue in multicellular organisms?
○ a cell membrane
○ b nucleus
○ c chloroplast
○ d flagellum

Explanation:

Skin tissue in multicellular organisms acts as a protective outer barrier, regulates what enters/exits the body, and separates the internal environment from the outside. The cell membrane of the euglena performs the same core functions: it forms the outer boundary of the cell, controls the movement of substances in and out, and protects the internal cell structures. The nucleus controls cell activities, chloroplasts handle photosynthesis, and the flagellum enables movement, none of which match the role of skin.

Answer:

a. cell membrane