Which one of the following is categorised as aparasite in true sense?
The female Anopheles bites and sucks blood from humans
Human foetus developing inside the uterus draws nourishment from the mother
Head louse living on the human scalp as well as laying eggs on human hair
The cuckoo (koel) lays its eggs in crow’s nest.
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
Animals eating plants are categorised separately as ...$A$..., they are in a broad ecological context, not very different from ...$B$...
Choose the correct option $A$ and $B$
Association between suckerfish $ (Remora) $ and shark is
In stable population predation
What is brood parasitism ? Explain with the help of an example.