Which one is not a characteristic of predation?

Gause's law is related to:

Explain predation with a suitable example.

Identify the examples of Commensalism and Mutualism from the given list:
$I -$ Mango tree and Orchid
$II -$ Fungi and Algae or Cyanobacteria (Lichen)
$III -$ Fungi and roots of higher plants (Mycorrhizae)
$IV -$ Whale and Barnacles
$V -$ Sea Anemone and Clown fish
$VI -$ Plants and Seed dispersers
$VII -$ Plants and Pollinators
$VIII -$ Cattle egret and Grazing cattle
Commensalism $\quad\quad$ Mutualism

The graph below shows the changes in two populations of herbivores in a grassy field. $A$ possible reason for these changes is that

Identify the type of population interaction in which both interacting species benefit.