Summarize the main principles of the cell theory.​

The correct answer is Logistic.

Explanation:

In logistic population growth S-shaped(sigmoid)  growth curve is obtained. In logistic population growth initially, the population increase slowly which means the population is establishing the new environment.

Once the population is established then it grows very fast and exponentially until the environmental resistance starts increasing. Environmental resistance slows down the growth rate of the population until it reaches equilibrium.  

At equilibrium, there is no net increase in population due to the number of individuals born is equal to number of individual dies. At this phase, the population reached to maximum carrying capacity and the growth become constant. So this type of growth curve is called logistic growth.