Who demonstrated that five closely related species of warblers living on the same tree were able to avoid competition and coexist?

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

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

Which one of the following population interactions is widely used in medical science for the production of antibiotics?

Which of the following statements is incorrect?

Level of competition between species depends on
$I.$ availability of resources
$II.$ population density
$III.$ group interaction of organisms
Choose the correct combination