Rule of 69-72 is for finding doubling time. I usually just use the natural log function to do that.
If it's geometric growth and they give you 'r' and it's units. Multiply
'r' by the number of organisms at that time to find by how much the population will increase in one unit of time (dN/dt). That's only for populations with periodic (geometric) growth.
I haven't actually ever been asked for exponential and logistic growth other than graphing.
To find the total growth in exponential, use N(total)=N(initial)*e^(rt)...I remember it as 'Nert"
And in logistic growth, dN/dt (r) = max r*(1-N/K)...there's an equation to find total growth, but I don't remember it, and I doubt you'll need to know it.
Also r = b (birth rate) - d (mortality rate)...that's assuming no immigrants/emigrants. If they put those in there as well remember to add immigrant and subtract emigrants.
Natural selection is never very hard. Know what it is and be able to write an essay describing how it occurs. Also know the difference between directional, stabilizing, and disruptional. They probably won't get much more in depth than that.
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