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Which type of neuron stimulates muscles to contract?

Which property is best to use when determining the strength of an ionic bond in a solid lattice energy conductivity hardness solubility

After dinner with his brother, charles darwin looked through a book by thomas robert malthus, who believed that humanity, if unchecked, could double its population size in 25 years . why then , wasn't the earth overrun with humans at this point ? how does this relate to the stoning of the darwin's carriage?