LIFE SCIENCE

Detailed explanation-1: -A major change occurring in the evolution of eukaryotes from prokaryotes was the development of: E) the nucleus. In eukaryotes, the nucleus is enclosed by a double membrane called the: B) nuclear envelope.

Detailed explanation-2: -The first eukaryotes evolved from ancestral prokaryotes by a process that involved membrane proliferation, the loss of a cell wall, the evolution of a cytoskeleton, and the acquisition and evolution of organelles.

Detailed explanation-3: -Note that eukaryotic cells likely evolved from a symbiotic relationship between two prokaryotic cells, whereby one set of prokaryotic DNA eventually became separated by a nuclear envelope and formed a nucleus.

Detailed explanation-4: -Many biologists speculate that the first major steps in the evolution of a eukaryotic cell from a prokaryotic ancestor would be the loss of a cell wall and the development of an extensive cytoskeleton.