AP BIOLOGY

Detailed explanation-1: -Net reproductive rate (r) is calculated as: r = (births-deaths)/population size or to get in percentage terms, just multiply by 100. the population is so much bigger, many more individuals are added. If a population grows by a constant percentage per year, this eventually adds up to what we call exponential growth.

Detailed explanation-2: -Exponential growth takes place when a population’s per capita growth rate stays the same, regardless of population size, making the population grow faster and faster as it gets larger.

Detailed explanation-3: -And while every population pyramid is unique, most can be categorized into three prototypical shapes: expansive (young and growing), constrictive (elderly and shrinking), and stationary (little or no population growth). Let’s take a deeper dive into the trends these three shapes reveal about a population and its needs.

Detailed explanation-4: -intrinsic rate of increase (r) *Values above zero indicate that the population is increasing. The higher the value of r, the faster the intrinsic growth rate of the population.