Question

which feature, possessed by eukaryotes but lacking in cyanobacteria, allowed formation of a nuclear envelope? flagella cilia cytoskeletal elements digestive vacuoles flexible cell membrane

Explanation:

Cytoskeletal elements in eukaryotes provide structural support and are involved in the formation of the nuclear envelope. Cyanobacteria lack a well - developed cytoskeleton. Flagella and cilia are for movement, digestive vacuoles are for digestion, and a flexible cell membrane is common to many cells but not specifically related to nuclear envelope formation.

Answer:

C. Cytoskeletal elements