Which of the following is the correct reason for the extinction of Abingdon tortoises in the Galapagos Islands?

Given below are two statements:
Statement-$I$: For plants,herbivores are the predators.
Statement-$II$: Nearly $25\%$ of all insects are known to be phytophagous.

The orchid $Ophrys$ employs 'sexual deceit' to get pollinated by a species of bee. One petal of its flower bears an uncanny resemblance to the female of the bee in size,colour,and markings. The male bee perceives it as the female and attempts to copulate with the flower. During this process,pollen grains are dusted on the male bee's body. What is this phenomenon called?

Assertion : Animals adopt different strategies to survive in hostile environments.
Reason : Praying mantis is green in colour which merges with plant foliage.

$A$ : The interaction between sea anemone and clown fish is commensalism.
$R$ : The fish gets protection from predators but anemone does not appear to derive any benefit.

What is the significance of mimicry?