Which of these is an example of mutualism A. Cattle egret eats the exposed insects as the cattle graze
B. Honeybee pollinates a flower while gathering nectar
C. Tick gains nourishment by sucking blood from a dog.
D. Two bucks fight to gain territory and to gain a mate.

B. Honeybee pollinates a flower while gathering nectar.

Explanation:

Mutualism is the idea that both organisms benefit from an interaction. In example B, the honeybee benefits because they receive nectar, while the flower benefits in being pollinated.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

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