What structure are you likely able to see in the pollen tube, and when would you be able to see it?

What structure are you likely able to see in the pollen tube, and when would you be able to see it? or:What structure are you likely able to see in th

What structure are you likely able to see in the pollen tube, and when would you be able to see it?

or:What structure are you likely able to see in the pollen tube, and when would you be able to see it?

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