Since conserved residues usually correspond to functionally important sites of proteins, what might be the function of this highly conserved "H" (histidine, location 87) residue based on its location in the structure?

it’s lava came from an explosive eruption

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well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.