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hmmm I have tried the last couple of days, and im really not sure how to do this

So I want my starting value for aG to be 1.2 and I want it to go down to at least 0.35 with a decrease of 0.5 for each time step

how do we change aG with time

ClearAll["Global`*"] (*R = reds, G = greys*) (*S = susceptible, I = infected, R = recovered*) tseries = {t, 0, 3}; vars = {HG[t], HR[t], SG[t], IG[t], RG[t], SR[t], IR[t], aG[t], qG[t]}; b = 0.4; (*natural mortality rate, both species*) \[Beta] = 0.7; (*rate of virus transmission*) aR =...