A relationship in which a sea anemone attached to shall of the hermit crab is called

$a.$ Loss of unnecessary sense organs
$b.$ Pressence of adhesive organs
$c.$ Presence of suckers
$d.$ High reproductive capacity
$e.$ Well developed digestive system
Choose correct option w.r.t. parasites

Competition for food, light and space is most severe between two

Stopage of reproduction in an organism by creating hurdle in its biology or physiology or its distruction by use of another organism is known as

Pollinator mutualism are special interactions involving ...$A$..., which receive food or a place to lay eggs and ...$B$..., which receive polle from other of their kind.

Choose of correct option for $A$ and $B$

Given below are two statements:

Statement $I$: Gause's competitive exclusion principle states that two closely related species competing for different resources cannot exist indefinitely.

Statement $II$: According to Gause's principle, during competition, the inferior will be eliminated. This may be true if resources are limiting.

In the light of the above statements, choose the correct answer from the options given below :