Cycadophyta is a group of plants with a small number of extant species, that is nevertheless well known from fossils from the Mesozoic era. Living "cycads" are nearly identical to fossils. What best explains these "living fossils"? A. Biological homology B. Punctuated equilibria C. Phylogenetic niche conservatism D. Passive trends E. Hopeful monsters

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• Corrected and streamlined text: During the final phase of cellular respiration, known as oxidative phosphorylation, the electron carriers reduced in earlier stages are oxidized by oxygen through the electron transport chain. The energy released through this oxidation is conserved in a form utilized by most cellular energy-dependent reactions. Among the following compounds involved in cellular respiration, identify those that are the net inputs and net outputs of oxidative phosphorylation. Drag each compound to the correct bin based on whether it is an input, an output, or not involved in oxidative phosphorylation. Note that not all inputs and outputs are listed. (glucose, CO2, O2, ATP, ADP, NAD+, NADH, H2O, coenzyme A, pyruvate, acetyl-CoA) Net Inputs for Oxidative Phosphorylation: - O2 - ADP - NADH (and/or other reduced electron carriers like FADH2, though not listed here) - Pi (inorganic phosphate, though not listed here) Net Outputs for Oxidative Phosphorylation: - ATP - H2O - NAD+ (and/or other oxidized electron carriers like FAD, though not listed here) Not Involved in Oxidative Phosphorylation: - glucose - CO2 - coenzyme A - pyruvate - acetyl-CoA (Note: In some contexts, CO2 is considered an output of earlier stages of cellular respiration but not directly of oxidative phosphorylation. Similarly, glucose is the initial substrate for glycolysis, not oxidative phosphorylation, and coenzyme A, pyruvate, and acetyl-CoA play roles in the transition step from glycolysis to the citric acid cycle or within the citric acid cycle itself.)