This tree has cambium, which is the inner osteogenic layer of the periosteum, which is a highly cellular zone immediately beneath the epithelium, which is covering a botryoid sarcoma.

 
 
 
This cactus is an adaption of a plant, because this plant adapted to it’s arid conditions by having spikes to protect it from predators, and wide leaves for coserving water.
 

The Krebs Cycle is the sequence of reactions by which most living cells generate energy during the process of aerobic respiration, like in this plant.

 
 
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