  In the present work, we prove that, if $A(\cdot)$ is a compact almost
automorphic matrix and the system $$x'(t) = A(t)x(t)\, ,$$ possesses an
exponential dichotomy with Green function $G(\cdot, \cdot)$, then its
associated system $$y'(t) = B(t)y(t)\, ,$$ where $B(\cdot) \in H(A)$ (the hull
of $A(\cdot)$) also possesses an exponential dichotomy. Moreover, the Green
function $G(\cdot, \cdot)$ is compact Bi-almost automorphic in $\mathbb{R}^2$,
this implies that $G(\cdot, \cdot)$ is $\Delta_2$ - like uniformly continuous,
where $\Delta_2$ is the principal diagonal of $\mathbb{R}^2$, an important
ingredient in the proof of invariance of the compact almost automorphic
function space under convolution product with kernel $G(\cdot, \cdot)$.
Finally, we study the existence of a positive compact almost automorphic
solution of non-autonomous differential equations of biological interest having
non-linear harvesting terms and mixed delays.
