The interaction between two living organisms of different species which is beneficial to both but is not obligatory because they can live without each other is known as

Relate Column $I$ with Column $II$ with regard to predatory behaviour:

Column $I$	Column $II$
$A$. Calotropis	$i$. Invertebrates
$B$. Pisaster	$ii$. Distasteful
$C$. Monarch butterfly	$iii$. Cryptically coloured
$D$. Frogs	$iv$. Cardio glycosides

Which type of interrelation is observed in species $A$ $(+)$ and species $B$ $(-)$?

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

Which of the following statements regarding species interdependence are true?
$I.$ An association of two species where one is benefited and the other remains unaffected is called mutualism.
$II.$ An interspecific association where both partners derive benefit from each other is called commensalism.
$III.$ $A$ direct food relation between two species of animals in which one animal kills and feeds on another is referred to as predation.
$IV.$ $A$ relationship between two species of organisms where both partners are benefited from each other is called symbiosis.

What is the type of interaction between a sucker fish (Remora) and a shark?