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What is an organ made of?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

Which of the following would be most useful for detecting the brain areas that are most active as a person performs mathematical calculations? a. a brain lesionb. an interneuronc. a pet scand. a hemispherectomy