During logistic growth, the sigmoid curve will level off when:
1. the population stops reproducing
2. the population starts reproducing asexually
3. the population reaches the environmental carrying capacity
4. sigmoid growth curves never levels off

Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called.
1. Morbidity.
2. Fecundity.
3. Biotic potential.
4. Environmental resistance.

When does the growth rate of a population following the logistic model equal zero? The logistic model is given
As dN/dt=rN(1─N/K)
1. when N/K is exactly one.
2. when N nears the carrying capacity of the habitat.
3. when N/K equals zero.
4. when death rate is greater than birth rate.

The logistic population growth is expressed by the equation:

1. $\frac{dN}{dt}=rN\left(\frac{N-K}{N}\right)$

2. $\frac{dt}{dN}=Nr\left(\frac{K-N}{K}\right)$

3. $\frac{dN}{dt}=rN\left(\frac{K-N}{K}\right)$

4. $\frac{dN}{dt}=rN$