3: Cellular Aging Last updated Feb 28, 2025 Save as PDF 2.8: Theory 7- Cross-linkage Theory 3.1: The Cell Page ID84770 Lumen LearningLumen Learning ( \newcommand{\kernel}{\mathrm{null}\,}\) 3.1: The Cell3.2: Membranes3.3: Organelles3.4: The Nucleus and DNA Replication3.5: How Scientists Study Cells3.6: Cellular Changes During Aging