Which characteristic does mycorrhiza represent?

Barnacles growing on the back of a whale is an example of .........

Which one of the following is $INCORRECT$ about population interaction?

$A$ bird enters the mouth of a crocodile and feeds on parasitic leeches. The bird gets food and the crocodile gets rid of blood-sucking leeches. Both partners can live independently. Such an association is:

An orchid plant grows on the branch of a mango tree. What type of interaction exists between the orchid and the mango tree?

$A$ scorpion stalks,kills,and then eats a spider. Based on its behavior,which ecological terms describe the scorpion?