We want to analyze the given graph, we will see that it is exponential growth, so it means that as time passes, the spore population increases.
There are two types of exponential behaviors, exponential growths, where we have an increase that is slow at the beginning and gets faster as the variable increases, and exponential decay, where we have a decrease that is fast at the beginning and gets slower as the variable increases.
Here we can see that we have an increase in the independent variable (the population) and that it is slower at first and then gets faster.
So we can conclude that the population of mold spores is increasing, and it increases exponentially, so we have exponential growth.
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