Explain the distinction between exogenous variables and endogenous variables. Explain the distinction, if any, between a parameter

Question:

Explain the distinction between exogenous variables and endogenous variables. Explain the distinction, if any, between a parameter and an exogenous variable. For the most complete model used in this chapter, which of the following variables are endogenous? Which are exogenous?
(a) Autonomous taxes
(b) Consumption
(c) Marginal propensity to consume
(d) Exports
(e) Net exports
(f) GDP
(g) Price level
(h) Interest rate
(i) Investment
(j) Tax revenue
(k) Disposable income
(l) Saving
(m) Foreign trade surplus (deficit)
(n) Government budget surplus (deficit)