Answer:
Carrying capacity
Step-by-step explanation:
The graph shows the growth of a population of yeast cells over time. The solid line shows that they go through an expontential growth phase (log phase) where they are growing very quickly before plateuing.
The graph shows that the solid line plateus at the height of the dotted line. The dotted represents the number of yeast cells at which the population reaches the maximum - the carrying capcity.
The carrying capacity of an environment is the maximum population that can be sustained in that environment due to size and resources.