The relationship between algae and fungi in a lichen is known as:

Who demonstrated that five closely related species of warblers living on the same tree were able to avoid competition and coexist?

Define/Explain: Endoparasites.

Select the correct statement which explains best parasitism.

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

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