BC is the number is years before counting years began. Basically, it is just like a negative number, where the smaller the number after the negative sign, the larger it is. For example, -4 is more than -6. To solve this, we take away 2500 from 2020.
2500 - 2020 = -480
<h2>480 BC (480 Years before Counting)</h2><h2>I'm always happy to help :)</h2>
Population change, defined generally, is the difference in the size of a population between the end and the beginning of a given time period (usually one year).... Population change has two components: natural population change (the number of live births minus the number of deaths);
Increase in resources and health provide longer life expectancy in places
