It is relationship between Ophrys orchid and male bee.

In following which are examples of commensalism ?

$(1)$ Monarch butterfly and bird

$(2)$ Orchid and mango

$(3)$ Fish and flamingo

$(4)$ Calotropis and cattle

$(5)$ Cattle egret and grazing cattle

$A$ : Cattle or goat never graze on Calotropis.
$R$ : Thorns are present as a morphological means of defence

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

Gause's law is true only when

Give the scientific names of any two microorganisms inhabiting the human intestine.