What is heterospory? Describe how it has led to the evolution of seed habit in plants?

Heterospory refers to the production of two distinct types of spores by certain plants. In heterosporous plants, there are typically two types of spores—megaspores and microspores. Megaspores develop into female gametophytes, while microspores ______ _______ ____ ____ _________ ______ _________ ______ __________ _____ __________ ______.
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