One of the major difficulties in the biological control of insect pests is that

Competition is best defined as a process in which the fitness of one species (measured in terms of its $' r '$ the intrinsic rate of increase) is significantly

Lower in presence of another superior species

When one organism is benefitted without affecting the others is called

While living in and on the host species, the animal parasite has evolved certain adaptations. Describe these adaptations with examples.

Give differences: Commensalism and Mutualism.