$A$ cuckoo laying eggs in the nest of other species of birds,is an example of

What did Gause demonstrate regarding ecology and competition?

While explaining interspecific interaction of population,$(+)$ sign is assigned for beneficial interaction,$(-)$ sign is assigned for detrimental interaction and $(0)$ for neutral interaction. Which of the following interactions can be assigned $(+)$ for one species and $(-)$ for another species involved in the interaction?

The most successful parasite is one that:

Competition for light,nutrients,and space is most severe between:

For a limited resource, two closely related species compete for the same resource, which is known as $.........$, which keeps them in check in the environment.