Parasitic diseases and predator/prey relationships are all examples of factors in an ecosystem.

Inter specific Interaction Factor

Explanation:

Inter specific Interaction Factor

Inter specific Interactions are basically the relationships established between different species in an ecosystem.  

There are several types of interaction established in an ecosystem which are as follows –

a)Predation/Prey – A predator feed upon the other species of ecosystem referred to as prey in general

b)Mutualism – Two species in an ecosystem lives in a mutual relationship in which both the partners get benefited.  

c)Commensalism - Two species in an ecosystem lives in a commensalism relationship in which one species is benefited while the other is harmed.  

d)Parasitism – This is a kind of commensalism relationship in which one species is benefited while the other is harmed.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.