题目内容
Pollination is that _____________ are transferred on the stigmas.
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The fusion of male and female gametes (or cells) is called the_____________.
True fruit is developed from___________ only.
Plants use different strategies to spread their seeds,such as ___________, ___________, ________________, _____________.
When animals transmit seeds, it is generally necessary to have _______or _________structures on the surface of fruits to be carried easily
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