A) one population inhibits the other
B) interaction is favourable to both, but not obligatory
C) interaction is favourable to both, but obligatory
D) neither population affects the other
Correct Answer: B
Solution :[b] Proto cooperation is the ecological interaction, in which both participants benefit and that is not obligatory for their survival. Proto cooperation is a harmonious inter-specific ecological interaction e.g. the spur- winged plover, which eats residues from crocodile teeth by using its beak.
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