we very much hope is goes back up... or we all die
Population growth in which the growth rate decreases with increasing number of individuals until it becomes zero when the population reaches a maximum.
A logistic growth pattern occurs when the population reaches its carrying capacity, at which point the population growth is zero.
The number of births must be the same as the number of deaths in a population for a growth rate to be zero.
Zero growth
Zero population growthThe so-called replacement rate is about 2.2 births per fertile woman. That's what a society needs to maintain zero population growth. That "extra" 0.2 people is what's needed to account for premature deaths -- deaths that occur before procreation. Zero population occurs when the numbers of birth rate and death rate are the same/equal.
On a graph of population growth the size of the population when the growth rate decreases to zero represents an area's carrying capacity.
Clearly not. Most growth occurs from ages 0-18. How often do you see a 35 year old getting taller each year? The growth rate is probably modeled well by an exponential decay (high when you are a baby, almost zero when you are 75).
Negative means people are leaving. Zero means that people are coming and going in equal amounts.
If the population growth rate becomes zero the population size becomes static. It stays where it was when it became zero until the rate changes. If the rate becomes negative the population would begin to shrink.
Zero birth rate occurs when babies are born as fast as other people in the same country are dying. Births = deaths = zero birth rate.
cute
Zero population growth is a sign of a low birthrate. Other factors that affect population growth include a stagnant Death Rate and a low mortality age.