Answer: when the death rate is equal to the birth rate the population growth is zero that means there is no increase and decrease of population in that particular year.
I think its a context clue for a producer or well an inorganic chemical reaction.
I would say that the sectional tensions strengthened during the 1850s mostly because of slavery. As you already know, historically, the North and the South of US were very different. The North went out of its way to abolish slavery, whereas the South was pro-slavery. This is what created many tensions, and later on, even more wars between these two sections.
Agriculture and pastoralism<span> began to transform human societies. </span>Pastoralism<span> and</span>agriculture led<span> to more reliable and </span>abundant food supplies<span> which increased population. Surpluses of </span>food<span> and other goods </span>led<span> to specialization of labor, including new classes of artisans and warriors, and the development of elites</span>
