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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