Cytoskeleton - only found in eukaryotic cells, this structure acts as muscle and skeleton for cells, aiding with movement and stability.
Mitochondria - eukaryotic cells aquired mitochondira via the endosymbiotic theory (A big cell ate a little cell but didn't digest it because the little cell could help it function better by producing energy for the big cell) and this membrane bound organelle produces evergy that is used by countless activities that occur within the cell.
Endomembrane System - this postal service of different materials a cell creates and uses consists of the nuclear envelope, ER, golgi apparatus, plasma membrane, as well as other organelles.
These conserved core processes and features support the idea of common ancestry for all organisms, because ALL eukaryotic cells have these features. This suggests that at some point in time, all organisms with eukaryotic cells originated from a single ancestor, and evolution/ natural selection lead to the 'birth' of new species.
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