The relationship between two organisms or species in which both partners derive benefit from each other is known as:

Myrmecophily is a beneficial association between a flowering plant and

An organism that depends on others can be described as a ..... parasite.

Two closely related species competing for the same resources cannot coexist indefinitely and the competitively inferior will be eliminated eventually. This principle is known as:

The most successful parasite is one that:

Identify the correct types of ecological interactions represented by $P$,$Q$,$R$ and $S$.

Interaction between Species $A$ and Species $B$	Type of interaction
$+$,$-$	$P$
$-$,$-$	$Q$
$+$,$0$	$R$
$-$,$0$	$S$