Explain why natural selection might favor a high reproduction rate in organisms with type 3 survivorship curves

Natural Selection, Survival of the fittest favors the “fit” and adaptable to survive in the harsh and hostile environment. Organisms that has a Type 3 survivorship curves has high reproduction rate since it also has greatest mortality rate. And why does natural selection favor these type of organisms is because these organism first-handedly were able to “adapt”. The theories states that organism need to be adaptable to survive hence, their reproductive mechanisms were stimulated and improved with the awareness of the susceptibility and vulnerability of these type of species.